[clang-tools-extra] [clang-tidy] Improve alternate snake case warnings (PR #71385)

[Piotr Zegar via cfe-commits]

PiotrZSL wrote:

@jcmoyer Do you want this be merged as jcmoyer at users.noreply.github.com ? If not then please disable privacy settings in GitHub or change author of commit.

https://github.com/llvm/llvm-project/pull/71385