message: Fix typo in EventSystem
diff: @@ -579,7 +579,7 @@ export class EventSystem
  * The returned {@link PIXI.FederatedWheelEvent} is a shared instance. It will not persist across
  * multiple native wheel events.
  *
  - * @param nativeEvent - The native wheel event that occured on the canvas.
  + * @param nativeEvent - The native wheel event that occurred on the canvas.
  * @return A federated wheel event.
  */
  protected normalizeWheelEvent(nativeEvent: WheelEvent): FederatedWheelEvent
  