[clang] [llvm] [clang-format] Add CI check confirming ClangFormatStyleOptions.rst is up-to-date. (PR #111513)

[Iuri Chaer via cfe-commits]

ichaer wrote:

Sample failure: https://github.com/llvm/llvm-project/actions/runs/11233429933/job/31227131778?pr=111513#step:10:127

https://github.com/llvm/llvm-project/pull/111513