[libc++] Libc++ release notes for LLVM 17 are not accessible

[ldionne]

The link to the libc++ 17 release notes present in https://releases.llvm.org points to https://releases.llvm.org/17.0.1/projects/libcxx/docs/ReleaseNotes.html. Instead, it should point to https://releases.llvm.org/17.0.1/projects/libcxx/docs/ReleaseNotes/17.html.

[ldionne]

@tru @tstellar Do you folks have an idea what needs to change here?

[ldionne]

I fixed this on the libc++ side by ensuring that we still publish stuff at ReleaseNotes.html. I think it makes sense to keep this a stable name.

[tstellar]

@ldionne The llvm/www-releases repository is where you can adjust the links if you want.