[llvm-branch-commits] [llvm] [docs] Convert first batch of CommandGuide docs to Markdown (PR #219625)

[Aiden Grossman via llvm-branch-commits]

https://github.com/boomanaiden154 approved this pull request.

I skimmed all the new HTML output and everything there LGTM.

https://github.com/llvm/llvm-project/pull/219625