[clang] [Clang][Comments] Support for parsing headers in Doxygen \par commands (PR #91100)

[Aaron Ballman via cfe-commits]

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

LGTM! Please be sure to add a release note to clang/docs/ReleaseNotes.rst so users know about the new functionality.

https://github.com/llvm/llvm-project/pull/91100