code: public DescribeReplicationInstancesResult withReplicationInstances(ReplicationInstance... replicationInstances) {
          if (this.replicationInstances == null) {
              setReplicationInstances(new java.util.ArrayList<ReplicationInstance>(replicationInstances.length));
          }
          for (ReplicationInstance ele : replicationInstances) {
              this.replicationInstances.add(ele);
          }
          return this;
      }
docs: <p>
  The replication instances described.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setReplicationInstances(java.util.Collection)} or {@link #withReplicationInstances(java.util.Collection)}
  if you want to override the existing values.
  </p>
  
  @param replicationInstances
  The replication instances described.
  @return Returns a reference to this object so that method calls can be chained together.