Second batch of spelling fixes in manual

doc/src/2001/input_commands.html

doc/src/99/input_commands.html

doc/src/Section_commands.txt

doc/src/Section_errors.txt

doc/src/Section_howto.txt

doc/src/Section_modify.txt

doc/src/Section_packages.txt

doc/src/Section_python.txt

doc/src/Section_start.txt

doc/src/Section_tools.txt

doc/src/accelerate_intel.txt

doc/src/accelerate_kokkos.txt

doc/src/atom_style.txt

doc/src/balance.txt

doc/src/change_box.txt

doc/src/compute.txt

doc/src/compute_centro_atom.txt

doc/src/compute_chunk_atom.txt

doc/src/compute_coord_atom.txt

doc/src/compute_event_displace.txt