P0220R1 added std::sample from Library Fundamentals v1 to the WP, but
this isn't mentioned in SD-6.
I suggest adding __cpp_lib_sample to the P0220R1 section of the C++17 table.
[5.15.106] says that sample was omitted from P0220R1, but it wasn't
(see 12.3 in the proposal, and note that we only took the version that
is in LFTS v1, whereas LFTS v2 has another overload).
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