Fixed #16608 -- Clarified the description of the destroy_test_db method and...

Fixed #16608 -- Clarified the description of the destroy_test_db method and cleaned up various other reST/Sphinx-related bits in the testing docs. Thanks to Stan for the report and Julien for the draft patch.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@16625 bcc190cf-cafb-0310-a4f2-bffc1f526a37