[libc++][docs] Retarget completion of P2944R3 to LLVM 22 (#163753) The completion of P2944R3 (4a509f853fa4821ecdb0f6bc3b90ddd48794cc8c) just missed LLVM 21 release, and it seems controversial that whether such feature completion should be backported. I'm aware of following-up cleanup and bugfix about `<tuple>`. Perhaps it will become more and more unwise to backport the changes. So let's retarget P2944R3 to LLVM 22 in documentations. Drive-by: Also fixes the formatting of the entry of P3379R0.
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