typo

fixing small typo in Example 3.

extension.html

@@ -337,7 +337,7 @@ <h2>Examples</h2>
     clearPoint(e.pageX, e.pageY);
   for (let e of event.getCoalescedEvents())
     drawPoint(e.pageX, e.pageY);
-  predicted_points = event.getPredictedevents();
+  predicted_points = event.getPredictedEvents();
   for (let e of predicted_points)
     drawPoint(e.pageX, e.pageY);
 });