[llvm-branch-commits] [clang-tools-extra] [clang-tidy][docs] Rewrite readability check docs to Markdown [1/5] (PR #221447)

[via llvm-branch-commits]

https://github.com/EugeneZelenko approved this pull request.

But will be good idea to wait for @vbvictor review.

https://github.com/llvm/llvm-project/pull/221447