docs: add @params tag to windowResized()

src/core/environment.js

@@ -424,6 +424,7 @@ p5.prototype.windowHeight = getWindowHeight();
  * canvas or do any other adjustments to accommodate the new window size.
  *
  * @method windowResized
+ * @param {Object} [event] optional Event callback argument.
  * @example
  * <div class="norender"><code>
  * function setup() {