docs: public DescribeScalingActivitiesRequest withActivityIds(String... activityIds) {
          if (this.activityIds == null) {
              setActivityIds(new com.amazonaws.internal.SdkInternalList<String>(activityIds.length));
          }
          for (String ele : activityIds) {
              this.activityIds.add(ele);
          }
          return this;
      }