Fixed #14875 - moved mention of `email_re` in 1.2 release notes from features...

Fixed #14875 - moved mention of `email_re` in 1.2 release notes from features deprecated to backwards incompatible changes. thanks galund for the report and elbarto for the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@14866 bcc190cf-cafb-0310-a4f2-bffc1f526a37