docs: revert changes in windowResized()

remove description about "return false"
remove @param, @return tags
(see #4988)

src/core/environment.js

@@ -421,14 +421,9 @@ p5.prototype.windowHeight = getWindowHeight();
 /**
  * The <a href="#/p5/windowResized">windowResized()</a> function is called once
  * every time the browser window is resized. This is a good place to resize the
- * canvas or do any other adjustments to accommodate the new window size.<br><br>
- * Browsers may have different default behaviors attached to various UI
- * events. To prevent any default behavior for this event, add "return false"
- * to the end of the method.
+ * canvas or do any other adjustments to accommodate the new window size.
  *
  * @method windowResized
- * @param  {Object} [event] optional UIEvent callback argument.
- * @return {*} false if any default behavior should be prevented for this event. (Optional)
  * @example
  * <div class="norender"><code>
  * function setup() {