Fix: Add missing span constructors and guides #518

Job	Run time
build_windows (NO)	3m 24s
build_linux_deprecated_extensions (gcc-9, ubuntu-22.04)	2m 7s
build_windows_deprecated_extensions	3m 16s
build_windows (YES)	3m 43s
build_linux (gcc-9, ubuntu-22.04, NO)	2m 16s
build_linux_deprecated_extensions (gcc-10, ubuntu-22.04)	2m 22s
build_linux (gcc-10, ubuntu-22.04, NO)	2m 17s
build_linux_deprecated_extensions (clang-13, ubuntu-22.04)	2m 29s
build_linux (gcc-10, ubuntu-22.04, YES)	2m 31s
build_linux_deprecated_extensions (ubuntu-24.04, gcc-14, g++-14)	2m 23s
build_linux (clang-13, ubuntu-22.04, NO)	2m 28s
build_linux_deprecated_extensions (ubuntu-24.04, clang-18, clang++-18)	2m 29s
build_linux (clang-15, ubuntu-22.04, NO)	2m 25s
build_linux (clang-15, ubuntu-22.04, YES)	2m 35s
build_linux (ubuntu-24.04, gcc-14, g++-14)	2m 18s
build_linux (ubuntu-24.04, clang-18, clang++-18)	2m 26s
	41m 29s

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