[llvm] [llvm-ar] --help: fix unquoted angle bracket (PR #101364)

[Linux User via llvm-commits]

LinuxUserGD wrote:

@jh7370 Sorry and thank you for the explanation. I don't have merge permissions for LLVM, so please merge if it's ready.
I've changed the email address in the GitHub profile settings to public.

https://github.com/llvm/llvm-project/pull/101364