[llvm-branch-commits] [libcxx] release/23.x: [libc++] Reword confusing warning message about AppleClang version (#222380) (PR #224073)

[Douglas Yung via llvm-branch-commits]

dyung wrote:

This change normally would not make our bar for the release branch (only fixing crashes and regressions), but it is so small that I'm happy to take it if @ldionne is okay with it.

https://github.com/llvm/llvm-project/pull/224073