docs: public DescribeDBInstancesResult withDBInstances(DBInstance... dBInstances) {
          if (this.dBInstances == null) {
              setDBInstances(new java.util.ArrayList<DBInstance>(dBInstances.length));
          }
          for (DBInstance ele : dBInstances) {
              this.dBInstances.add(ele);
          }
          return this;
      }