update documentation metadata files for recent changes

dump_image.html

dump_modify.html

dump_molfile.html

dump_nc.html

echo.html

fix.html

fix_modify.html

fix_controller.html

fix_deform.html

fix_deposit.html

fix_dpd_energy.html

fix_drag.html

fix_drude.html

fix_drude_transform.html

fix_viscous.html

fix_wall.html

fix_wall_gran.html

fix_wall_gran_region.html

fix_wall_piston.html

fix_wall_reflect.html

fix_wall_region.html

compute_xrd.html

pair_adp.html

pair_agni.html

pair_airebo.html

pair_awpmd.html

pair_beck.html

USER/atc/man_unfix_nodes.html

USER/atc/man_write_atom_weights.html

USER/atc/man_write_restart.html

   :maxdepth: 1

   pair_adp

   pair_agni

   pair_airebo

   pair_awpmd

   pair_beck