docs: public ModifyInstanceCreditSpecificationResult withUnsuccessfulInstanceCreditSpecifications(
              UnsuccessfulInstanceCreditSpecificationItem... unsuccessfulInstanceCreditSpecifications) {
          if (this.unsuccessfulInstanceCreditSpecifications == null) {
              setUnsuccessfulInstanceCreditSpecifications(new com.amazonaws.internal.SdkInternalList<UnsuccessfulInstanceCreditSpecificationItem>(
                      unsuccessfulInstanceCreditSpecifications.length));
          }
          for (UnsuccessfulInstanceCreditSpecificationItem ele : unsuccessfulInstanceCreditSpecifications) {
              this.unsuccessfulInstanceCreditSpecifications.add(ele);
          }
          return this;
      }