add missing information of javadoc in cluster module (#2285)

Author: mychaow

cluster/src/main/java/org/apache/iotdb/cluster/server/member/MetaGroupMember.java

@@ -398,7 +398,7 @@ protected void initSubServers() throws TTransportException, StartupException {
 
   /**
    * Parse the seed nodes from the cluster configuration and add them into the node list. Each
-   * seedUrl should be like "{hostName}:{metaPort}:{dataPort}" Ignore bad-formatted seedUrls.
+   * seedUrl should be like "{hostName}:{metaPort}:{dataPort}:{clientPort}" Ignore bad-formatted seedUrls.
    */
   protected void addSeedNodes() {
     if (allNodes.size() > 1) {