[libc-commits] [libc] [libc][docs] adds macro handling, POSIX status, and validation to docgen (PR #89421)

[via libc-commits]

enh-google wrote:

> Thanks @enh-google ! @Flandini let's use `POSIX.1-2017` then? When 2024 edition is published, we can update this field name.

sgtm; https://man7.org/linux/man-pages/man7/standards.7.html also explicitly uses 2017 rather than 2018.

https://github.com/llvm/llvm-project/pull/89421