docs: public DescribeSubnetGroupsResult withSubnetGroups(SubnetGroup... subnetGroups) {
          if (this.subnetGroups == null) {
              setSubnetGroups(new java.util.ArrayList<SubnetGroup>(subnetGroups.length));
          }
          for (SubnetGroup ele : subnetGroups) {
              this.subnetGroups.add(ele);
          }
          return this;
      }