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

[Aiden Grossman via cfe-commits]

boomanaiden154 wrote:

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

Could we just test that the output looks as expected? I think it would be pretty easy to write a lit test that asserts all of the output is as expected. That would then show up in review.

It would be a bit of a hack, but it would solve the original problem, making sure that the docs actually get updated with the script automatically, and that things show up in review.

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