[clang-tools-extra] [clang-tidy][docs] Rewrite short check docs to Markdown (PR #210467)

[Zeyi Xu via cfe-commits]

zeyi2 wrote:

> I found that table seem to render incorrectly https://clang.llvm.org/extra/clang-tidy/checks/modernize/redundant-void-arg.html But another one is correct https://clang.llvm.org/extra/clang-tidy/checks/modernize/deprecated-ios-base-aliases.html

Fixed in https://github.com/llvm/llvm-project/pull/212692

https://github.com/llvm/llvm-project/pull/210467