[clang] [llvm] [clang-format] Add cmake target clang-format-style-options for updating ClangFormatStyleOptions.rst (PR #111513)

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Andarwinux wrote:

If CLANG_INCLUDE_DOCS=OFF then this should be skipped, otherwise the build will fail if llvm/clang/docs doesn't exist.

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