Add some comments to stop header reordering when formatting

argparse/argparse.c

src/black_holes_struct.h

src/chemistry.h

src/cooling/EAGLE/cooling_tables.c

src/cooling/EAGLE/cooling_tables.h

src/cooling/QLA_EAGLE/cooling_tables.c

src/cosmology.h

src/engine_config.c

src/line_of_sight.h

src/memswap.h

src/mesh_gravity_patch.c

src/neutrino/Default/neutrino_response.c

src/sink_struct.h

tests/testAdiabaticIndex.c

tests/testDistance.c

tests/testErfc.c

tests/testExp.c

tests/testHashmap.c

tests/testHydroMPIrules.c

tests/testKernel.c