[clang] Docs: ambiguous use of "explicitly" in [[clang::no_specializations]] (PR #143839)

[Kit Dallege via cfe-commits]

kovan wrote:

Hi @mdavis36, are you still planning to update this with the agreed-upon wording from @frederick-vs-ja? It's been a few months since the last update. Happy to pick this up if you're no longer working on it.

https://github.com/llvm/llvm-project/pull/143839