message: Update API comment
diff: @@ -266,6 +266,7 @@ export class SurveyModel extends Base
  * <br/> sender the survey object that fires the event
  * <br/> options.data the values of all non-empty questions on the current page. You can get a question value as options.data["myQuestionName"].
  * <br/> options.errors set your errors to this object as: options.errors["myQuestionName"] = "Error text";. It will be shown as a question error.
  + * <br/> options.complete() call this function to tell survey that your server callback has been processed.
  * @see onValidateQuestion
  * @see onValidatePanel
  */
  