P3355R0: Add "Fix submdspan for C++26" proposal#462

mhoemmen wants to merge 2 commits intoORNL:masterORNL/cpp-proposals-pub:masterfrom

mhoemmen:P3355R0-submdspan-fixesmhoemmen/cpp-proposals-pub:P3355R0-submdspan-fixesCopy head branch name to clipboard