Demos: Fixed small typo.

(cherry picked from commit b99f825)

Author: onovy

demos/draggable/snap-to.html

@@ -20,7 +20,7 @@
 		$( "#draggable" ).draggable({ snap: true });
 		$( "#draggable2" ).draggable({ snap: ".ui-widget-header" });
 		$( "#draggable3" ).draggable({ snap: ".ui-widget-header", snapMode: "outer" });
-		$( "#draggable4" ).draggable({ grid: [ 20,20 ] });
+		$( "#draggable4" ).draggable({ grid: [ 20, 20 ] });
 		$( "#draggable5" ).draggable({ grid: [ 80, 80 ] });
 	});
 	</script>