docs(tutorial): referenced test.bat for Windows users in step 2

Closes angular#5748

Author: leniel

docs/content/tutorial/step_02.ngdoc

@@ -191,8 +191,8 @@ You can do this by issuing `npm install` into your terminal.
 To run the test, do the following:
 
 1. In a _separate_ terminal window or tab, go to the `angular-phonecat` directory and run
-`./scripts/test.sh` to start the Karma server (the config file necessary to start the server
-is located at `./config/karma.conf.js`).
+   `./scripts/test.sh` (if you are on Windows, run scripts\test.bat) to start the Karma server (the
+   config file necessary to start the server is located at `./config/karma.conf.js`).
 
 2. Karma will start a new instance of Chrome browser automatically. Just ignore it and let it run in
    the background. Karma will use this browser for test execution.