move browser testing section

explain in-browser testing as part of the existing unit testing section

Author: vijithassar

developer_docs/README.md

@@ -54,6 +54,14 @@ To run the unit tests, use Grunt.
 $ grunt
 ```
 
+Sometimes it is useful to run the tests in the browser instead of on the command line. To do this, first start the [connect](https://github.com/gruntjs/grunt-contrib-connect) server:
+
+```
+$ npm run grunt connect -keepalive
+```
+
+With the server running, you should be able to open test/test.html in your favorite web browser.
+
 # Development Process
 
 1. Install [node.js](http://nodejs.org/), which also automatically installs the [npm](https://www.npmjs.org) package manager.
@@ -127,12 +135,6 @@ This will build the p5.js library, generate the documentation files, run a web s
     npm run docs:dev
     ```
 
-## Running tests in the browser
-Sometimes it is useful to run tests in browser especially when trying to debug test failures.  To run the tests in the browser:
-
-1. Run the connect server. ```npm run grunt connect -keepalive```
-2. Open test/test.html in your favourite web browser.
-
 # Repositories
 
 * https://github.com/processing/p5.js - this repo contains the source code for the p5.js library, and the p5.dom.js addon library. The reference is also generated from this code, as the documentation and examples are located in the source code itself, maintained by Lauren McCarthy.