Merge branch 'main' into P2278R4_cbegin

# Conflicts:
#	libcxx/docs/Status/Cxx23Issues.csv
#	libcxx/docs/Status/Cxx23Papers.csv
#	libcxx/docs/Status/Cxx2cIssues.csv
#	libcxx/include/iterator
#	libcxx/include/ranges
#	libcxx/include/span
#	libcxx/include/string_view
#	libcxx/test/std/containers/views/views.span/span.iterators/begin.pass.cpp
#	libcxx/test/std/containers/views/views.span/span.iterators/end.pass.cpp
#	libcxx/test/std/containers/views/views.span/span.iterators/rbegin.pass.cpp
#	libcxx/test/std/containers/views/views.span/span.iterators/rend.pass.cpp
#	libcxx/test/std/containers/views/views.span/types.pass.cpp

Author: frederick-vs-ja