[1.2.X] Adjust AdminDocTests to run after r13728. Also match comments to tests...

[1.2.X] Adjust AdminDocTests to run after r13728. Also match comments to tests and add test that was there in comment form only.Refs #3695.

Backport of r13737 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@13750 bcc190cf-cafb-0310-a4f2-bffc1f526a37