A few fixes for the testing documentation:

 * Removed an extra semicolon that was preventing the rendering of a Sphinx class directive for the `Client()` class.
 * Indented `Client` class's methods.
 * Added linebreaks after attribute directives of `Response` class so Sphinx rendenders them correctly.
 * Removed trailing whitespace.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@8567 bcc190cf-cafb-0310-a4f2-bffc1f526a37