Merge branch '4.4' into 5.1

* 4.4:
  Update location of preloading file

Author: javiereguiluz

performance.rst

@@ -110,8 +110,8 @@ make them available to all requests until the server is restarted, improving
 performance significantly.
 
 During container compilation (e.g. when running the ``cache:clear`` command),
-Symfony generates a file called ``.preload`` (with a leading ``.``) in the
-``src/`` directory with the list of classes to preload.
+Symfony generates a file called ``preload.php`` in the ``config/`` directory
+with the list of classes to preload.
 
 The only requirement is that you need to set both ``container.dumper.inline_factories``
 and ``container.dumper.inline_class_loader`` parameters to ``true``. Then, you
@@ -120,7 +120,7 @@ can configure PHP to use this preload file:
 .. code-block:: ini
 
     ; php.ini
-    opcache.preload=/path/to/project/src/.preload.php
+    opcache.preload=/path/to/project/config/preload.php
 
 Use the :ref:`container.preload <dic-tags-container-preload>` and
 :ref:`container.no_preload <dic-tags-container-nopreload>` service tags to define