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

[James Henderson via llvm-commits]

jh7370 wrote:

If you've had at least 3 non-trivial PRs merged, you can request commit access. See https://llvm.org/docs/DeveloperPolicy.html#obtaining-commit-access. I believe you have?

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