[clang] [Sema] Suggest missing format attributes (PR #166738)

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apple-fcloutier wrote:

Thank you for addressing my comments; I think now we either agree on the changes to make or have made them. The last thing I forgot before is to mention -Wmissing-format-attributes in clang/docs/ReleaseNotes.rst, under "Improvements to Clang's diagnostics".

https://github.com/llvm/llvm-project/pull/166738