[clang] [clang][diagnostics] Refactor "warn_doc_function_method_decl_mismatch" to use enum_select (PR #146426)

[Ayokunle Amodu via cfe-commits]

ayokunle321 wrote:

@erichkeane I made a new identical PR with the email problem fixed - https://github.com/llvm/llvm-project/pull/181769.


https://github.com/llvm/llvm-project/pull/146426