Standardize suffix paragraph in fix_enforce2d.txt

doc/src/fix_enforce2d.txt

@@ -28,12 +28,13 @@ not move from their initial z coordinate.
 
 :line
 
-Styles with a 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 in
-"Section 5"_Section_accelerate.html of the manual.  The
-accelerated styles take the same arguments and should produce the same
-results, except for round-off and precision issues.
+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 in "Section 5"_Section_accelerate.html
+of the manual.  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