[clang] [clang] Update diagnostics for type aware allocators (PR #148576)

[Corentin Jabot via cfe-commits]

https://github.com/cor3ntin commented:

Can you update the release notes?

The entry is in C++2c support, it should be... under New Feature, perhaps?

> - Implemented `P2719R4 Type-aware allocation and deallocation functions <https://wg21.link/P2719>`_ **as an extension** in all(?) C++ language modes.

https://github.com/llvm/llvm-project/pull/148576