[llvm-branch-commits] [clang] [docs] Migrate 20 clang docs from reST to Markdown (PR #206182)

[Yanzuo Liu via llvm-branch-commits]

zwuis wrote:

Please update `clang/docs/ReleaseNotesTemplate.txt` since the script clearing release notes just copies the file to `clang/docs/ReleaseNotes.md`.

https://github.com/llvm/llvm-project/pull/206182