[1.0.X] Fixed #10845 -- Clarified the examples for using ModelForms with...

[1.0.X] Fixed #10845 -- Clarified the examples for using ModelForms with fields or exclude specified. Thanks to Andrew Durdin for the suggestion.

Merge of r10972 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10975 bcc190cf-cafb-0310-a4f2-bffc1f526a37