Fixed #13023 - Removed ambiguity with regard to the max_num option of formsets...

Fixed #13023 - Removed ambiguity with regard to the max_num option of formsets and as a result of admin inlines. Thanks to Gabriel Hurley for the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@12872 bcc190cf-cafb-0310-a4f2-bffc1f526a37