Update docs

doc/src/compute_orientorder_atom.rst

@@ -3,6 +3,9 @@
 compute orientorder/atom command
 ================================
 
+compute orientorder/atom/kk command
+=======================
+
 Syntax
 """"""
 
@@ -132,6 +135,30 @@ too frequently.
    :doc:`special_bonds <special_bonds>` command that includes all pairs in
    the neighbor list.
 
+----------
+
+
+Styles with a *gpu*\ , *intel*\ , *kk*\ , *omp*\ , or *opt* suffix are
+functionally the same as the corresponding style without the suffix.
+They have been optimized to run faster, depending on your available
+hardware, as discussed on the :doc:`Speed packages <Speed_packages>` doc
+page.  The accelerated styles take the same arguments and should
+produce the same results, except for round-off and precision issues.
+
+These accelerated styles are part of the GPU, USER-INTEL, KOKKOS,
+USER-OMP and OPT packages, respectively.  They are only enabled if
+LAMMPS was built with those packages.  See the :doc:`Build package <Build_package>` doc page for more info.
+
+You can specify the accelerated styles explicitly in your input script
+by including their suffix, or you can use the :doc:`-suffix command-line switch <Run_options>` when you invoke LAMMPS, or you can use the
+:doc:`suffix <suffix>` command in your input script.
+
+See the :doc:`Speed packages <Speed_packages>` doc page for more
+instructions on how to use the accelerated styles effectively.
+
+
+----------
+
 **Output info:**
 
 This compute calculates a per-atom array with *nlvalues* columns,