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: 4f9f921b081c523744c7bf24d959a0db39629563@822 bcc190cf-cafb-0310-a4f2-bffc1f526a37

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