[1.2.X] Fixed #14120 - Document get() in Making Queries - thanks danielr and...

[1.2.X] Fixed #14120 - Document get() in Making Queries - thanks danielr and adamv for work on the patch.

Backport of r14820 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@14821 bcc190cf-cafb-0310-a4f2-bffc1f526a37