[clang-tools-extra] [clangd] Add tweak for turning an unscoped into a scoped enum (PR #67645)

[via cfe-commits]

https://github.com/5chmidti commented:

I just found small nits, and could you please add this to the release notes? 
Looks nice overall

https://github.com/llvm/llvm-project/pull/67645