docs: public ListUserPoolClientsResult withUserPoolClients(UserPoolClientDescription... userPoolClients) {
          if (this.userPoolClients == null) {
              setUserPoolClients(new java.util.ArrayList<UserPoolClientDescription>(userPoolClients.length));
          }
          for (UserPoolClientDescription ele : userPoolClients) {
              this.userPoolClients.add(ele);
          }
          return this;
      }