code: public DescribeBrokerResult withBrokerInstances(BrokerInstance... brokerInstances) {
          if (this.brokerInstances == null) {
              setBrokerInstances(new java.util.ArrayList<BrokerInstance>(brokerInstances.length));
          }
          for (BrokerInstance ele : brokerInstances) {
              this.brokerInstances.add(ele);
          }
          return this;
      }
docs: A list of information about allocated brokers.
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setBrokerInstances(java.util.Collection)} or {@link #withBrokerInstances(java.util.Collection)} if you
  want to override the existing values.
  </p>
  
  @param brokerInstances
  A list of information about allocated brokers.
  @return Returns a reference to this object so that method calls can be chained together.