Add 1.2 beta release notes to release notes index.
Add 1.2 beta release notes to release notes index.

--HG--
extra : convert_revision : svn%3Abcc190cf-cafb-0310-a4f2-bffc1f526a37/django/trunk%4012391

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