[llvm] [llvm-otool] Fix error messages to use -p instead of --dis-symname (PR #181225)

[James Henderson via llvm-commits]

https://github.com/jh7370 approved this pull request.

Just to clarify, `--dis-symname` is the llvm-objdump name for the option and `-p` is the llvm-otool` name. Is that correct? If so, LGTM.

Do you have the ability to merge this in yourself yet?

https://github.com/llvm/llvm-project/pull/181225