docs: public DescribeScalingActivitiesResult withScalingActivities(ScalingActivity... scalingActivities) {
          if (this.scalingActivities == null) {
              setScalingActivities(new java.util.ArrayList<ScalingActivity>(scalingActivities.length));
          }
          for (ScalingActivity ele : scalingActivities) {
              this.scalingActivities.add(ele);
          }
          return this;
      }