[1.8.x] Made LiveServerTestCase example use StaticLiveServerTestCase.

Backport of 6b5ae92927 from master

docs/topics/testing/tools.txt

@@ -826,12 +826,21 @@ Python path:
     $ pip install selenium
 
 Then, add a ``LiveServerTestCase``-based test to your app's tests module
-(for example: ``myapp/tests.py``). The code for this test may look as follows::
+(for example: ``myapp/tests.py``). For this example, we'll assume you're using
+the :mod:`~django.contrib.staticfiles` app and want to have static files served
+during the execution of your tests similar to what we get at development time
+with ``DEBUG=True``, i.e. without having to collect them using
+:djadmin:`collectstatic`. We'll use
+the  :class:`~django.contrib.staticfiles.testing.StaticLiveServerTestCase`
+subclass which provides that functionality. Replace it with
+``django.test.LiveServerTestCase`` if you don't need that.
 
-    from django.test import LiveServerTestCase
+The code for this test may look as follows::
+
+    from django.contrib.staticfiles.testing import StaticLiveServerTestCase
     from selenium.webdriver.firefox.webdriver import WebDriver
 
-    class MySeleniumTests(LiveServerTestCase):
+    class MySeleniumTests(StaticLiveServerTestCase):
         fixtures = ['user-data.json']
 
         @classmethod