[clang] [clang-format][CMake] Generate formatting options docs during build (PR #113739)

[via cfe-commits]

https://github.com/mydeveloperday requested changes to this pull request.

Ok so here now lie a problem, we'll not "see the ClangFormatStyleOptions.rst" during the review, so we'll not be able to sanity check the code in Format.h has been correctly generated. I feel this is a backward step and will likely lead to invalid documentation.

I'd personally like a solution that doesn't remove the ClangFormatStyleOptions.rst from the review

https://github.com/llvm/llvm-project/pull/113739