[llvm-branch-commits] [clang] [docs] Migrate 20 clang docs from reST to Markdown (PR #206182)

[Reid Kleckner via llvm-branch-commits]

rnk wrote:

This is ready to review, and I manually clicked all 40 HTML links in that table, and confirmed that all of the visual differences are *fixes* to broken reST syntax, so this change makes our docs strictly more syntactically correct.

I also computed the set of named references before and after and compared them with a local script, so there should be no broken links, and there's even some validation that the links point to the correct content.

https://github.com/llvm/llvm-project/pull/206182