Updated docs for vashishta/gpu

doc/src/Section_errors.txt

@@ -8890,6 +8890,14 @@ This is a requirement to use this potential. :dd
 
 See the newton command.  This is a restriction to use this potential. :dd
 
+{Pair style vashishta/gpu requires atom IDs} :dt
+
+This is a requirement to use this potential. :dd
+
+{Pair style vashishta/gpu requires newton pair off} :dt
+
+See the newton command.  This is a restriction to use this potential. :dd
+
 {Pair style tersoff/gpu requires atom IDs} :dt
 
 This is a requirement to use the tersoff/gpu potential. :dd

doc/src/pair_vashishta.txt

@@ -7,6 +7,7 @@
 :line
 
 pair_style vashishta command :h3
+pair_style vashishta/gpu command :h3
 pair_style vashishta/omp command :h3
 pair_style vashishta/kk command :h3
 pair_style vashishta/table command :h3