Comment and/or doc changes. #504

Job	Run time
set-vars	1s
setup	6s
doc-clang-15-release	7m 2s
gcc-9-debug-cxx17	6m 30s
gcc-9-release-cxx17	9m 20s
gcc-9-relwithdebinfo-cxx17	12m 22s
gcc-9-minsizerel-cxx17	7m 49s
gcc-10-debug-cxx17	6m 45s
gcc-10-release-cxx17	8m 48s
gcc-10-relwithdebinfo-cxx17	10m 57s
gcc-10-minsizerel-cxx17	7m 38s
gcc-11-debug-cxx17	7m 4s
gcc-11-release-cxx17	8m 52s
gcc-11-relwithdebinfo-cxx17	10m 35s
gcc-11-minsizerel-cxx17	7m 14s
gcc-13-debug-cxx17	7m 30s
gcc-13-release-cxx17	9m 38s
gcc-13-relwithdebinfo-cxx17	11m 31s
gcc-13-minsizerel-cxx17	8m 38s
clang-13-debug-cxx17	6m 29s
clang-13-release-cxx17	7m 37s
clang-13-relwithdebinfo-cxx17	8m 21s
clang-13-minsizerel-cxx17	7m 7s
clang-15-debug-cxx17	6m 22s
clang-15-release-cxx17	7m 40s
clang-15-relwithdebinfo-cxx17	8m 31s
clang-15-minsizerel-cxx17	7m 7s
clang-15-relwithdebinfo-asan-cxx17	10m 47s
clang-15-relwithdebinfo-ubsan-cxx17	10m 28s
clang-15-relwithdebinfo-tsan-cxx17	8m 38s
clang-16-debug-cxx17	7m 0s
clang-16-release-cxx17	7m 59s
clang-16-relwithdebinfo-cxx17	8m 45s
clang-16-minsizerel-cxx17	7m 29s
clang-16-relwithdebinfo-asan-cxx17	11m 11s
clang-16-relwithdebinfo-ubsan-cxx17	11m 44s
clang-16-relwithdebinfo-tsan-cxx17	9m 13s
clang-17-debug-cxx17	7m 14s
clang-17-release-cxx17	9m 10s
clang-17-relwithdebinfo-cxx17	8m 44s
clang-17-minsizerel-cxx17	7m 43s
clang-17-relwithdebinfo-asan-cxx17	11m 15s
clang-17-relwithdebinfo-ubsan-cxx17	11m 45s
clang-17-relwithdebinfo-tsan-cxx17	10m 29s
gcc-13-debug-cxx20	8m 7s
gcc-13-relwithdebinfo-cxx20	12m 23s
clang-17-debug-cxx20	7m 55s
clang-17-relwithdebinfo-cxx20	9m 35s
	6h 45m 8s

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