[libcxx-commits] [libcxx] [libc++][doc] Update the release notes for LLVM 20. (PR #124403)

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h-vetinari wrote:

W.r.t.
https://github.com/llvm/llvm-project/blob/6805d7e8aa5f2ecea021acbb8c6b4c29ca432e78/libcxx/docs/ReleaseNotes/20.rst?plain=1#L47
I believe the remaining bits were fully implemented by https://github.com/llvm/llvm-project/commit/def50f701f6a2c1e0550bb341fd8b64bed299e72, including the FTM

https://github.com/llvm/llvm-project/pull/124403