[clang-tools-extra] [clang-tidy] Improve readability-enum-initial-value diagnostic message (PR #176485)

[Donát Nagy via cfe-commits]

https://github.com/NagyDonat commented:

LGTM at first glance. I didn't study the details, but overall the code is nice and clean :)

https://github.com/llvm/llvm-project/pull/176485