docs: public DescribeSubnetGroupsRequest withSubnetGroupNames(String... subnetGroupNames) {
          if (this.subnetGroupNames == null) {
              setSubnetGroupNames(new java.util.ArrayList<String>(subnetGroupNames.length));
          }
          for (String ele : subnetGroupNames) {
              this.subnetGroupNames.add(ele);
          }
          return this;
      }