tests

Improve documentation of the fault feature code. #1729

Job	Run time
coverage	14m 2s
test_indentation	27s
linux-gdb-valgrind (ubuntu-22.04, Debug)	17m 27s
test_linux_and_macos_mpi (ubuntu-latest, Release)	4m 33s
test_linux_and_macos_mpi (macos-latest, Release)	6m 59s
test_linux_and_macos (ubuntu-latest, Release)	3m 31s
test_linux_non_unity_no_optional_dependencies (ubuntu-latest, Debug)	9m 12s
test_windows (windows-2022, Release, Visual Studio 17 2022)	6m 20s
test_linux_and_macos (ubuntu-latest, Debug)	8m 21s
test_windows (windows-2022, Debug, Visual Studio 17 2022)	1h 19m 38s
test_linux_and_macos (macos-latest, Release)	4m 56s
test_linux_and_macos (macos-latest, Debug)	17m 26s
test_linux_and_macos (macos-11, Release)	5m 30s
test_linux_and_macos (macos-11, Debug)	14m 49s
linux-cmake_mpi (ubuntu-latest, 2.8.12, TRUE, Release)	5m 54s
linux-cmake_mpi (ubuntu-latest, 2.8.12, FALSE, Release)	6m 12s
linux-gcc_mpi (ubuntu-20.04, Debug)	9m 10s
linux-cmake_mpi (ubuntu-latest, 3.16.x, TRUE, Release)	4m 40s
linux-cmake_mpi (ubuntu-latest, 3.16.x, FALSE, Release)	3m 49s
linux-cmake_mpi (ubuntu-latest, 3.20.x, TRUE, Release)	4m 25s
linux-cmake_mpi (ubuntu-latest, 3.20.x, FALSE, Release)	3m 56s
	3h 51m 17s

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