web page c++-status proposal revision updates

[Heiko Eißfeldt]

For some C++26 language features listed on https://gcc.gnu.org/projects/cxx-status.html

there are newer proposal revisions available:

Remove undefined behavior from lexing P2621R3 <https://wg21.link/P2621R3>
constexpr structured bindings and references to constexpr variables P2686R5

<https://wg21.link/P2686R5>constexpr exceptions P3068R6 <https://wg21.link/P3068R6> <https://wg21.link/P2686R5>Oxford variadic comma P3176R1 <https://wg21.link/P3176R1>

Removing deprecated array comparisons P2865R6 <https://wg21.link/P2865R6>

Heiko

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