tests

Add documentation for generating documentation locally #1539

Job	Run time
test_indentation	25s
coverage	3m 30s
linux-gdb-valgrind (ubuntu-22.04, Debug)	11m 10s
test_linux_and_macos (ubuntu-latest, Release)	1m 25s
test_linux_non_unity_no_optional_dependencies (ubuntu-latest, Debug)	3m 9s
test_linux_and_macos_mpi (ubuntu-latest, Release)	2m 23s
test_linux_and_macos (ubuntu-latest, Debug)	2m 42s
test_linux_and_macos_mpi (macos-latest, Release)	2m 8s
test_linux_and_macos (macos-latest, Release)	3m 22s
test_windows (windows-2022, Release, Visual Studio 17 2022)	2m 13s
test_windows (windows-2022, Debug, Visual Studio 17 2022)	16m 10s
test_linux_and_macos (macos-latest, Debug)	3m 12s
test_linux_and_macos (macos-11, Release)	3m 0s
test_linux_and_macos (macos-11, Debug)	4m 1s
linux-cmake_mpi (ubuntu-latest, 2.8.12, TRUE, Release)	2m 35s
linux-cmake_mpi (ubuntu-latest, 2.8.12, FALSE, Release)	2m 33s
linux-gcc_mpi (ubuntu-20.04, Debug)	3m 1s
linux-cmake_mpi (ubuntu-latest, 3.16.x, TRUE, Release)	2m 16s
linux-cmake_mpi (ubuntu-latest, 3.16.x, FALSE, Release)	1m 54s
linux-cmake_mpi (ubuntu-latest, 3.20.x, TRUE, Release)	2m 20s
linux-cmake_mpi (ubuntu-latest, 3.20.x, FALSE, Release)	1m 44s
	1h 15m 13s

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