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this commit makes `deref_into_dyn_supertrait` lint allow-by-default, removes future incompatibility (we finally live in a broken world), and changes the wording in the documentation. previously documentation erroneously said that it lints against *usage* of the deref impl, while it actually (since 104742) lints on the impl itself (oooops, my oversight, should have updated it 2+ years ago...)