[llvm] [NFC] Fix outdated RecurKind comments (PR #144014)

[Ramkumar Ramachandra via llvm-commits]

https://github.com/artagnon commented:

@Mel-Chen I'm currently traveling, and away from the keyboard: could you kindly confirm that this is indeed outdated?

https://github.com/llvm/llvm-project/pull/144014