[clang-tools-extra] [clang-tools-extra] Update Maintainers for Clang-Doc (PR #175822)

[Aaron Ballman via cfe-commits]

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

LGTM though we should move Peter down to Inactive rather than remove entirely.

https://github.com/llvm/llvm-project/pull/175822