Add note about model validation to draft 1.2 release notes.
Add note about model validation to draft 1.2 release notes.

--HG--
extra : convert_revision : svn%3Abcc190cf-cafb-0310-a4f2-bffc1f526a37/django/trunk%4012111

adieu/django-nonrel,adieu/django-nonrel,adieu/django-nonrel