[llvm-branch-commits] [clang-tools-extra] [clang-doc] add support for concepts (PR #144430)

[Paul Kirth via llvm-branch-commits]

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

LGTM. overall really good improvement. most of my comments are me noticing bad existing code we should fix.

I also left a few nit comments to address, but they're rather minor.

https://github.com/llvm/llvm-project/pull/144430