[clang-tools-extra] [llvm] [clang-doc] Add standalone Markdown parsing library (PR #202991)

[Neil Nair via cfe-commits]

Neil-N4 wrote:

> Also, please do not add Copilot to reviews. This goes against our AI usage policy, as the automated reviews do not have a human in the loop. See https://llvm.org/docs/AIToolPolicy.html for more details, and any number of threads regarding LLM usage on discourse.llvm.org (even a recent RFC not doing this was quite contentious https://discourse.llvm.org/t/rfc-upstream-infrastructure-for-ai-review-of-prs/91042).

The Copilot review was added automatically by GitHub, not requested

https://github.com/llvm/llvm-project/pull/202991