[llvm-branch-commits] [llvm][NFC] Document cl::opt variable and fix typo (PR #90670)

[Florian Hahn via llvm-branch-commits]

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

LGTM, thanks!

For the title, it might be clearer to explicitly mention the variable this is documenting, commit title size permitting

https://github.com/llvm/llvm-project/pull/90670