correct link targets

doc/src/Section_howto.txt

doc/src/Section_intro.txt

doc/src/Section_packages.txt

doc/src/Section_start.txt

doc/src/accelerate_kokkos.txt

doc/src/compute_damage_atom.txt

doc/src/compute_dilatation_atom.txt

doc/src/compute_erotate_rigid.txt

doc/src/compute_plasticity_atom.txt

doc/src/compute_reduce.txt

doc/src/compute_temp_deform_eff.txt

doc/src/compute_temp_eff.txt

doc/src/dihedral_table.txt

doc/src/dump.txt

doc/src/dump_custom_vtk.txt

doc/src/fix_ave_chunk.txt

doc/src/fix_bond_create.txt

doc/src/fix_deform.txt

doc/src/fix_deposit.txt

doc/src/fix_ehex.txt