Fixed #601 -- Updated docs/model-api.txt unique_together section to say it's enforced at the database level.
Fixed #601 -- Updated docs/model-api.txt unique_together section to say it's enforced at the database level.

git-svn-id: 554f83ef17aa7291f84efa897c1acfc5d0035373@822 bcc190cf-cafb-0310-a4f2-bffc1f526a37

svn2github/django,svn2github/django,svn2github/django