[libcxx-commits] [libcxx] [libc++] Fix naming of value template parameters (PR #76888)

[Mark de Wever via libcxx-commits]

mordante wrote:

> I don't think I change the style here. We don't have a consistent style for NTTPs in the code base currently. I don't care much either way, but your reasoning seems quite flawed here.

I checked the `N` case before and `_Np` seems very common, so I'm not sure why my reasoning is flawed.
The changes to the clang-format style would make `_Np` invalid, which I dislike since the Standard uses `N` quite often.

https://github.com/llvm/llvm-project/pull/76888