docs: public ModifyReservedInstancesRequest withTargetConfigurations(ReservedInstancesConfiguration... targetConfigurations) {
          if (this.targetConfigurations == null) {
              setTargetConfigurations(new com.amazonaws.internal.SdkInternalList<ReservedInstancesConfiguration>(targetConfigurations.length));
          }
          for (ReservedInstancesConfiguration ele : targetConfigurations) {
              this.targetConfigurations.add(ele);
          }
          return this;
      }