docs: public DescribeDeliveryChannelsResult withDeliveryChannels(DeliveryChannel... deliveryChannels) {
          if (this.deliveryChannels == null) {
              setDeliveryChannels(new com.amazonaws.internal.SdkInternalList<DeliveryChannel>(deliveryChannels.length));
          }
          for (DeliveryChannel ele : deliveryChannels) {
              this.deliveryChannels.add(ele);
          }
          return this;
      }