tests

Add documentation for generating documentation locally #1531

Job	Run time
coverage	3m 45s
test_indentation	23s
test_linux_non_unity_no_optional_dependencies (ubuntu-latest, Debug)	3m 40s
test_linux_and_macos (ubuntu-latest, Release)	1m 25s
test_linux_and_macos (ubuntu-latest, Debug)	2m 15s
linux-gcc_mpi (ubuntu-20.04, Debug)	3m 2s
test_linux_and_macos (macos-latest, Release)	4m 21s
linux-cmake_mpi (ubuntu-latest, 2.8.12, TRUE, Release)	2m 32s
test_linux_and_macos (macos-latest, Debug)	3m 4s
linux-gdb-valgrind (ubuntu-22.04, Debug)	12m 53s
linux-cmake_mpi (ubuntu-latest, 2.8.12, FALSE, Release)	2m 26s
test_linux_and_macos (macos-11, Release)	3m 1s
linux-cmake_mpi (ubuntu-latest, 3.16.x, TRUE, Release)	2m 56s
test_linux_and_macos_mpi (ubuntu-latest, Release)	2m 1s
test_linux_and_macos (macos-11, Debug)	4m 11s
linux-cmake_mpi (ubuntu-latest, 3.16.x, FALSE, Release)	1m 49s
test_linux_and_macos_mpi (macos-latest, Release)	3m 35s
test_windows (windows-2022, Release, Visual Studio 17 2022)	2m 44s
linux-cmake_mpi (ubuntu-latest, 3.20.x, TRUE, Release)	3m 8s
test_windows (windows-2022, Debug, Visual Studio 17 2022)	16m 8s
linux-cmake_mpi (ubuntu-latest, 3.20.x, FALSE, Release)	1m 50s
	1h 21m 9s

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