docs: public DescribeCustomerGatewaysResult withCustomerGateways(CustomerGateway... customerGateways) {
          if (this.customerGateways == null) {
              setCustomerGateways(new com.amazonaws.internal.SdkInternalList<CustomerGateway>(customerGateways.length));
          }
          for (CustomerGateway ele : customerGateways) {
              this.customerGateways.add(ele);
          }
          return this;
      }