[libc-commits] [libc] [libc] Move hdrgen yaml files into include/ (PR #121443)

[Nick Desaulniers via libc-commits]

nickdesaulniers wrote:

Do you mind updating the libc/utils/hdrgen/README.rst? 9abcca5e25296 added a comment about `the yaml subdirectory` which now no longer exists after this PR.

https://github.com/llvm/llvm-project/pull/121443