Rollup merge of #120117 - NobodyXu:99262/update-api-and-doc, r=m-ou-se

Update `std::io::Error::downcast` return type

and update its doc according to decision made by rust libs-api team in https://github.com/rust-lang/rust/issues/99262#issuecomment-1894246216
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Matthias Krüger 2024-01-26 14:43:30 +01:00 committed by GitHub
commit 8648a7271b
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