[libc-commits] [libc] [docs][libc] Add AIO documentation refering POSIX and include in build (PR #122219)

[Nick Desaulniers via libc-commits]

https://github.com/nickdesaulniers approved this pull request.

Looks great! Thanks for flushing out the docs here! Need us to merge this for you?

https://github.com/llvm/llvm-project/pull/122219