update kitchen demo text

psGrammar/demos/cupro/kitchen_demo.jsgf

@@ -5,7 +5,7 @@ public <command> = [<robot>] ( <demo> | <save> | <place> | <introduction>);
 
 <robot> = (robot | tiago | tobi);
 
-<demo> = (demo);
+<demo> = (tell me about the kitchen drawer);
 <save> = (save location);
 <place> = (go to);
-<introduction> = (introduce)
+<introduction> = (introduce yourself)