[clang] [flang] [llvm] [Documentation] Replace recommonmark by myst-parser (PR #65664)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

> I'm sorry for being late to the party but what's the rationale for removing support for building manpages without myst-parser, that FWICS isn't used for manpages at all? I don't see any answer neither in the commit message, nor in this thread. It really feels like you've just _shrugged_ and removed it without any consideration for the prior effort to make things work better.

This is the first I've heard about this breaking anyone, can you give more information on what used to work for you and is now broken? Is myst-parser package not available for you?

https://github.com/llvm/llvm-project/pull/65664