[1.2.X] Fixed #11864 -- Improved the "see also" section of the many-to-one...

[1.2.X] Fixed #11864 -- Improved the "see also" section of the many-to-one model topic guide to more clearly connect people to the backwards-related objects docs and to the correct point in the model tests for sample code (since the doctests went away). Thanks to dwillis for the work on the patch.

Backport of [15758] from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@15759 bcc190cf-cafb-0310-a4f2-bffc1f526a37