docs: public DnsServersOptionsModifyStructure withCustomDnsServers(String... customDnsServers) {
          if (this.customDnsServers == null) {
              setCustomDnsServers(new com.amazonaws.internal.SdkInternalList<String>(customDnsServers.length));
          }
          for (String ele : customDnsServers) {
              this.customDnsServers.add(ele);
          }
          return this;
      }