tests

Add a few comments to distance_point_from_curved_planes #2515

Job	Run time
test_indentation	29s
coverage	4m 18s
test_linux_non_unity_no_optional_dependencies (ubuntu-24.04, Debug)	3m 11s
test_linux_and_macos_mpi (macos-13, Release)	2m 40s
test_linux_and_macos (macos-13, Release)	2m 54s
linux-valgrind (ubuntu-22.04, Debug)	28m 30s
test_linux_and_macos_mpi (ubuntu-24.04, Release)	2m 21s
test_linux_and_macos (ubuntu-24.04, Release)	1m 49s
test_linux_and_macos (ubuntu-22.04, Release)	1m 45s
test_windows (windows-2022, Debug, Visual Studio 17 2022)	10m 39s
test_windows (windows-2022, Release, Visual Studio 17 2022)	3m 57s
test_linux_and_macos (ubuntu-24.04, Debug)	2m 19s
test_linux_and_macos (macos-13, Debug)	2m 50s
linux-clang_flang_mpi (ubuntu-24.04, Debug)	3m 9s
linux-gdb (ubuntu-22.04, Debug)	3m 42s
test_linux_and_macos (ubuntu-22.04, Debug)	2m 17s
linux-gcc_mpi (ubuntu-24.04, Debug)	2m 35s
linux-cmake_mpi (ubuntu-24.04, 3.16.x, FALSE, Release)	2m 27s
linux-gcc_no_apps (ubuntu-24.04, Debug)	1m 0s
linux-cmake_mpi (ubuntu-24.04, 3.16.x, TRUE, Release)	4m 54s
linux-cmake_mpi (ubuntu-24.04, 3.20.x, TRUE, Release)	3m 14s
linux-cmake_mpi (ubuntu-24.04, 3.20.x, FALSE, Release)	2m 25s
linux-clang_gfortran_mpi (ubuntu-24.04, Debug)	2m 45s
	1h 36m 10s

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