Idiomatic phrase for small type words at end of a document
Solution 1:
The "small words" at the end (as the questioner put it) which contain some less positive information is colloquially called "the small print" in English.
Solution 2:
In Minnesota (fly-over land) it's almost always the "fine print". In fact, I don't think I've ever heard (do see it in print) "small print" used in conversations.