fixed loc grammar

ps-grammar/location/location.jsgf

@@ -9,7 +9,7 @@ public <statement> = <locationPhrase> [please];
 <location> = <appliance_class> | <shelf_class> | <seat_class> | <table_class> | <room_class> | <door_class> | <exit_class> | <everywhere_class>;
 
 <appliance_class> = (waste bin) | fridge | stove;
-<shelf_class> = bar | (side board) | (right sidetable | (left sidetable);
+<shelf_class> = bar | (side board) | (right sidetable) | (left sidetable);
 <seat_class> = <seating_class>;
 <seating_class> = sofa | armchair | bed;
 <table_class> = (kitchen table) | (hallway table) | (dinner table) | (couch table) ;