Fix up help message

bin/saturnin.skel

@@ -28,7 +28,8 @@ usage() {
 }
 
 print_help() {
-    echo "valid commands:"
+    echo ""
+    echo "valid sub-commands:"
     echo ""
     ls "$SATURNIN_LIBEXEC" \
       | sed -e 's/saturnin-/    /'