[libc-commits] [libc] [libc][docs] split "String Functions" into string.h, strings.h, stdlib.h, and inttypes.h (PR #118860)

[Nick Desaulniers via libc-commits]

nickdesaulniers wrote:

Note to reviewers, this PR is stacked on top of https://github.com/llvm/llvm-project/pull/118836 AND https://github.com/llvm/llvm-project/pull/118852. The first 2 commits should be skipped in review for this PR.

https://github.com/llvm/llvm-project/pull/118860