Fix links to Magento 2.3 filesystem

+ For Magento Architecture and Customization Techniques

Author: SubrataBauri

1. Magento Architecture and Customization Techniques/2. Describe Magento’s directory structure.md

@@ -37,7 +37,7 @@ In addition, you can choose the component root directory to start development. T
 >
 > -- [Magento DevDocs - About component file structure](https://devdocs.magento.com/guides/v2.2/extension-dev-guide/prepare/prepare_file-str.html)
 
-Class [Magento\Framework\Module\ModuleList\Loader](https://github.com/magento/magento2/blob/2.2-develop/lib/internal/Magento/Framework/Module/ModuleList/Loader.php#L78) load `etc/module.xml` files and sort modules by sequence.
+Class [Magento\Framework\Module\ModuleList\Loader](https://github.com/magento/magento2/blob/2.3/lib/internal/Magento/Framework/Module/ModuleList/Loader.php#L78) load `etc/module.xml` files and sort modules by sequence.
 The sequence use for sorting events, plugins, preferences and layouts.
 
 

1. Magento Architecture and Customization Techniques/4. Demonstrate how to use dependency injection.md

@@ -9,11 +9,11 @@ Magento loads di.xml files and merges them all together from the following stage
 
 ### Object manager
 
-Under the hood, the [ObjectManager](https://github.com/magento/magento2/blob/2.2-develop/lib/internal/Magento/Framework/ObjectManager/ObjectManager.php) 
+Under the hood, the [ObjectManager](https://github.com/magento/magento2/blob/2.3/lib/internal/Magento/Framework/ObjectManager/ObjectManager.php) 
 will use PHP reflection features to look at a class’s __construct type hints/parameters, 
 automatically instantiate the object for us, and then pass it into the constructor as an argument.
 
-[AbstractFactory](https://github.com/magento/magento2/blob/2.2-develop/lib/internal/Magento/Framework/ObjectManager/Factory/AbstractFactory.php) > [\Magento\Framework\ObjectManager\FactoryInterface](https://github.com/magento/magento2/blob/2.2-develop/lib/internal/Magento/Framework/ObjectManager/FactoryInterface.php)
+[AbstractFactory](https://github.com/magento/magento2/blob/2.3/lib/internal/Magento/Framework/ObjectManager/Factory/AbstractFactory.php) > [\Magento\Framework\ObjectManager\FactoryInterface](https://github.com/magento/magento2/blob/2.3/lib/internal/Magento/Framework/ObjectManager/FactoryInterface.php)
 and their implementations use to resolve arguments and create new objects.
 
 By default, all objects created via automatic constructor dependency injection are singleton objects,
@@ -26,7 +26,7 @@ if ($isShared) {
     $argument = $this->objectManager->create($argumentType);
 }
 ```
-[\Magento\Framework\ObjectManager\Factory::resolveArgument()](https://github.com/magento/magento2/blob/2.2-develop/lib/internal/Magento/Framework/ObjectManager/Factory/AbstractFactory.php#L143-L147)
+[\Magento\Framework\ObjectManager\Factory::resolveArgument()](https://github.com/magento/magento2/blob/2.3/lib/internal/Magento/Framework/ObjectManager/Factory/AbstractFactory.php#L143-L147)
 
 ### Arguments
 

1. Magento Architecture and Customization Techniques/5. Demonstrate ability to use plugins.md

@@ -3,7 +3,7 @@
 There are three types of plugins in magento: around, before and after.
 
 __Important__: Classes, abstract classes and interfaces that are implementations of or inherit from classes that have plugins will also inherit plugins from the parent class.
-For example, if you create a plugin for [\Magento\Catalog\Block\Product\AbstractProduct](https://github.com/magento/magento2/blob/2.2-develop/app/code/Magento/Catalog/Block/Product/AbstractProduct.php),
+For example, if you create a plugin for [\Magento\Catalog\Block\Product\AbstractProduct](https://github.com/magento/magento2/blob/2.3/app/code/Magento/Catalog/Block/Product/AbstractProduct.php),
 plugin methods will be called for all child classes, such as \Magento\Catalog\Block\Product\View, \Magento\Catalog\Block\Product\ProductList\Upsell etc.
 
 ### Limitations
@@ -131,9 +131,9 @@ Magento automatically generates `Interceptor` class for the plugin target and st
     }
 ```
 
-[\Magento\Framework\Interception\Interceptor](https://github.com/magento/magento2/blob/2.2-develop/lib/internal/Magento/Framework/Interception/Interceptor.php):
+[\Magento\Framework\Interception\Interceptor](https://github.com/magento/magento2/blob/2.3/lib/internal/Magento/Framework/Interception/Interceptor.php):
 
-- $pluginList = [\Magento\Framework\Interception\PluginListInterface](https://github.com/magento/magento2/blob/2.2-develop/lib/internal/Magento/Framework/Interception/PluginListInterface.php)
+- $pluginList = [\Magento\Framework\Interception\PluginListInterface](https://github.com/magento/magento2/blob/2.3/lib/internal/Magento/Framework/Interception/PluginListInterface.php)
 - $subjectType = 'MyBeautifulClass'
 - `___init` - called in in constructor, pluginList = get from object manager, subjectType = class name
 - pluginList->getNext

1. Magento Architecture and Customization Techniques/6. Configure event observers and scheduled jobs.md

@@ -45,7 +45,7 @@ Example:
 ```
 
 Observer class should be placed in the <module-root>/Observer directory and implement
-[Magento\Framework\Event\ObserverInterface](https://github.com/magento/magento2/blob/2.2-develop/lib/internal/Magento/Framework/Event/ObserverInterface.php)
+[Magento\Framework\Event\ObserverInterface](https://github.com/magento/magento2/blob/2.3/lib/internal/Magento/Framework/Event/ObserverInterface.php)
 interface.
 
 ```php
@@ -63,8 +63,8 @@ class MyObserver implements \Magento\Framework\Event\ObserverInterface
 
 ### Dispatching events
 
-Events dispatch by [Magento\Framework\Event\Manager](https://github.com/magento/magento2/blob/2.2-develop/lib/internal/Magento/Framework/Event/Manager.php) class
-that implement [Magento\Framework\Event\ManagerInterface](https://github.com/magento/magento2/blob/2.2-develop/lib/internal/Magento/Framework/Event/ManagerInterface.php) interface:
+Events dispatch by [Magento\Framework\Event\Manager](https://github.com/magento/magento2/blob/2.3/lib/internal/Magento/Framework/Event/Manager.php) class
+that implement [Magento\Framework\Event\ManagerInterface](https://github.com/magento/magento2/blob/2.3/lib/internal/Magento/Framework/Event/ManagerInterface.php) interface:
 > dispatch($eventName, array $data = []);
 
 Example:
@@ -144,16 +144,16 @@ generate
 check for standalone process
 ```
 
-[\Magento\Cron\Model\Config\Data](https://github.com/magento/magento2/blob/2.2-develop/app/code/Magento/Cron/Model/Config/Data.php) extends [\Magento\Framework\Config\Data](https://github.com/magento/magento2/blob/2.2-develop/lib/internal/Magento/Framework/Config/Data.php)
-- merges [\Magento\Cron\Model\Config\Reader\Db::get](https://github.com/magento/magento2/blob/2.2-develop/app/code/Magento/Cron/Model/Config/Reader/Db.php#L51) from Database
+[\Magento\Cron\Model\Config\Data](https://github.com/magento/magento2/blob/2.3/app/code/Magento/Cron/Model/Config/Data.php) extends [\Magento\Framework\Config\Data](https://github.com/magento/magento2/blob/2.3/lib/internal/Magento/Framework/Config/Data.php)
+- merges [\Magento\Cron\Model\Config\Reader\Db::get](https://github.com/magento/magento2/blob/2.3/app/code/Magento/Cron/Model/Config/Reader/Db.php#L51) from Database
 
   Sample DB structure:
 ```
 default/crontab/GROUP/jobs/JOB/schedule/cron_expr = '* * * * *'
 default/crontab/GROUP/jobs/JOB/schedule/config_path = 'some/config/path' -- try to read schedule from this config, store view scope
 default/crontab/GROUP/jobs/JOB/run/model = 'class::method'
 ```
-DB config usage example: [ProductAlert, system.xml](https://github.com/magento/magento2/blob/2.2-develop/app/code/Magento/ProductAlert/etc/adminhtml/system.xml#L38:L45), [ProductAlert, crontab.xml](https://github.com/magento/magento2/blob/2.2-develop/app/code/Magento/ProductAlert/etc/crontab.xml), backend model: [Magento\Cron\Model\Config\Backend\Product\Alert](https://github.com/magento/magento2/blob/2.2-develop/app/code/Magento/Cron/Model/Config/Backend/Product/Alert.php)
+DB config usage example: [ProductAlert, system.xml](https://github.com/magento/magento2/blob/2.3/app/code/Magento/ProductAlert/etc/adminhtml/system.xml#L38:L45), [ProductAlert, crontab.xml](https://github.com/magento/magento2/blob/2.3/app/code/Magento/ProductAlert/etc/crontab.xml), backend model: [Magento\Cron\Model\Config\Backend\Product\Alert](https://github.com/magento/magento2/blob/2.3/app/code/Magento/Cron/Model/Config/Backend/Product/Alert.php)
 
 `bin/magento cron:install` example:
 ```
@@ -180,7 +180,7 @@ TODO: find out
 
 ### Identify the function and proper use of automatically available events
 
-Model events [\Magento\Framework\Model\AbstractModel](https://github.com/magento/magento2/blob/2.2-develop/lib/internal/Magento/Framework/Model/AbstractModel.php):
+Model events [\Magento\Framework\Model\AbstractModel](https://github.com/magento/magento2/blob/2.3/lib/internal/Magento/Framework/Model/AbstractModel.php):
 
 - `model_load_before`, `{$_eventPrefix}_load_before`
 - `model_load_after`, `{$_eventPrefix}_load_after`
@@ -191,18 +191,18 @@ Model events [\Magento\Framework\Model\AbstractModel](https://github.com/magento
 - `model_delete_after`, `{$_eventPrefix}_delete_after`
 - `model_delete_commit_after`, `{$_eventPrefix}_delete_commit_after`
 
-Flat collection events [\Magento\Framework\Model\ResourceModel\Db\Collection\AbstractCollection](https://github.com/magento/magento2/blob/2.2-develop/lib/internal/Magento/Framework/Model/ResourceModel/Db/Collection/AbstractCollection.php):
+Flat collection events [\Magento\Framework\Model\ResourceModel\Db\Collection\AbstractCollection](https://github.com/magento/magento2/blob/2.3/lib/internal/Magento/Framework/Model/ResourceModel/Db/Collection/AbstractCollection.php):
 
 - `core_collection_abstract_load_before`, `{_eventPrefix}_load_before`
 - `core_collection_abstract_load_after`, `{_eventPrefix}_load_after`
 
 only if `_eventPrefix` and `_eventObject` defined: `{prefix}_load_before`, `{prefix}_load_after`
 
-EAV collection events [\Magento\Eav\Model\Entity\Collection\AbstractCollection](https://github.com/magento/magento2/blob/2.2-develop/app/code/Magento/Eav/Model/Entity/Collection/AbstractCollection.php):
+EAV collection events [\Magento\Eav\Model\Entity\Collection\AbstractCollection](https://github.com/magento/magento2/blob/2.3/app/code/Magento/Eav/Model/Entity/Collection/AbstractCollection.php):
 
 - eav_collection_abstract_load_before
 
-[\Magento\Framework\Model\AbstractModel](https://github.com/magento/magento2/blob/2.2-develop/lib/internal/Magento/Framework/Model/AbstractModel.php):
+[\Magento\Framework\Model\AbstractModel](https://github.com/magento/magento2/blob/2.3/lib/internal/Magento/Framework/Model/AbstractModel.php):
 
 - _eventObject = 'object'
 - _eventPrefix = 'core_abstract', e.g. 'catalog_category'

1. Magento Architecture and Customization Techniques/7. Utilize the CLI.md

@@ -97,8 +97,8 @@ class ExampleCommand extends \Symfony\Component\Console\Command\Command
 }
 ```
 
-- Declare your command in [\Magento\Framework\Console\CommandListInterface](https://github.com/magento/magento2/blob/2.2-develop/lib/internal/Magento/Framework/Console/CommandListInterface.php) using dependency injection ({module}/etc/di.xml).
-See also CommandListInterface implementation: [\Magento\Framework\Console\CommandList](https://github.com/magento/magento2/blob/2.2-develop/lib/internal/Magento/Framework/Console/CommandList.php)
+- Declare your command in [\Magento\Framework\Console\CommandListInterface](https://github.com/magento/magento2/blob/2.3/lib/internal/Magento/Framework/Console/CommandListInterface.php) using dependency injection ({module}/etc/di.xml).
+See also CommandListInterface implementation: [\Magento\Framework\Console\CommandList](https://github.com/magento/magento2/blob/2.3/lib/internal/Magento/Framework/Console/CommandList.php)
 
 {module}/etc/di.xml:
 ```xml

1. Magento Architecture and Customization Techniques/8. Demonstrate the ability to manage the cache.md

@@ -127,14 +127,14 @@ Sessions and caching data should never be stored in one database in Redis. In th
 ### Describe how to clear the cache programmatically.
 
 To clear the cache programmatically you neeed to call next the methods:
-- [\Magento\Framework\App\CacheInterface::remove($identifier)](https://github.com/magento/magento2/blob/2.2-develop/lib/internal/Magento/Framework/App/CacheInterface.php#L48) - remove cached data by identifier
-- [\Magento\Framework\App\CacheInterface::clean($tags = [])](https://github.com/magento/magento2/blob/2.2-develop/lib/internal/Magento/Framework/App/CacheInterface.php#L56) - clean cached data by specific tag
+- [\Magento\Framework\App\CacheInterface::remove($identifier)](https://github.com/magento/magento2/blob/2.3/lib/internal/Magento/Framework/App/CacheInterface.php#L48) - remove cached data by identifier
+- [\Magento\Framework\App\CacheInterface::clean($tags = [])](https://github.com/magento/magento2/blob/2.3/lib/internal/Magento/Framework/App/CacheInterface.php#L56) - clean cached data by specific tag
 
 ##### What mechanisms are available for clearing all or part of the cache?
 
 Dispatch a `clean_cache_by_tags` event with parameter of the object you want to clear from the cache.
 
-Example: [\Magento\Framework\Model\AbstractModel](https://github.com/magento/magento2/blob/2.2-develop/lib/internal/Magento/Framework/Model/AbstractModel.php#L817) (afterSave, afterDelete methods)
+Example: [\Magento\Framework\Model\AbstractModel](https://github.com/magento/magento2/blob/2.3/lib/internal/Magento/Framework/Model/AbstractModel.php#L817) (afterSave, afterDelete methods)
 
 ```php
 <?php
@@ -159,8 +159,8 @@ public function cleanModelCache()
 ```
 
 Default `clean_cache_by_tags` event observers are: 
-- [Magento\PageCache\Observer\FlushCacheByTags](https://github.com/magento/magento2/blob/2.2-develop/app/code/Magento/PageCache/Observer/FlushCacheByTags.php#L57) - if Built-In caching is enabled 
-- [Magento\CacheInvalidate\Observer\InvalidateVarnishObserver](https://github.com/magento/magento2/blob/2.2-develop/app/code/Magento/CacheInvalidate/Observer/InvalidateVarnishObserver.php#L50)- if Varnish caching is enabled
+- [Magento\PageCache\Observer\FlushCacheByTags](https://github.com/magento/magento2/blob/2.3/app/code/Magento/PageCache/Observer/FlushCacheByTags.php#L57) - if Built-In caching is enabled 
+- [Magento\CacheInvalidate\Observer\InvalidateVarnishObserver](https://github.com/magento/magento2/blob/2.3/app/code/Magento/CacheInvalidate/Observer/InvalidateVarnishObserver.php#L50)- if Varnish caching is enabled
 
 ###### Links
 - [Magento DevDocs - Magento cache overview](https://devdocs.magento.com/guides/v2.2/frontend-dev-guide/cache_for_frontdevs.html)