[libcxx-commits] [libcxx] [libc++][NFC] Fixed formatting in Release Notes (PR #173526)

[A. Jiang via libcxx-commits]

https://github.com/frederick-vs-ja approved this pull request.

Thanks! Although I believe P2321R2 is effectively completed and we can set the feature-test macro now.

(If there's any change about integer-class needed to be done, it should be tracked in #105171 ([P2393R1](https://wg21.link/P2393R1)).)

https://github.com/llvm/llvm-project/pull/173526