[clang] [Docs][Clang] Missing DR status for C++23-era papers in cxx_status.html (PR #68846)

[Vlad Serebrennikov via cfe-commits]

Endilll wrote:

@frederick-vs-ja PR description is going to be used as a commit message. You can edit it. Let me know when it's ready. 

https://github.com/llvm/llvm-project/pull/68846