docs: public ModifyReservedInstancesRequest withReservedInstancesIds(String... reservedInstancesIds) {
          if (this.reservedInstancesIds == null) {
              setReservedInstancesIds(new com.amazonaws.internal.SdkInternalList<String>(reservedInstancesIds.length));
          }
          for (String ele : reservedInstancesIds) {
              this.reservedInstancesIds.add(ele);
          }
          return this;
      }