[1.0.X] Fixed #9780 -- Fixed an undefined internal link in the model forms...

[1.0.X] Fixed #9780 -- Fixed an undefined internal link in the model forms documentation, thanks ramiro.

Backport of r9670 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@9671 bcc190cf-cafb-0310-a4f2-bffc1f526a37