HDFS-9043. Doc updation for commands in HDFS Federation (Contributed by J.Andreina)

(cherry picked from commit 57003fa971658c8482240f70445a6822c7692844)
(cherry picked from commit 96e3fbf401763c10e040b9d7dac2123f97895090)

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -47,6 +47,9 @@ Release 2.7.2 - UNRELEASED
     HDFS-9042. Update document for the Storage policy name
     (J.Andreina via vinayakumarb)
 
+    HDFS-9043. Doc updation for commands in HDFS Federation
+    (J.Andreina via vinayakumab)
+
 Release 2.7.1 - 2015-07-06
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/Federation.md

@@ -187,7 +187,7 @@ Perform the following steps:
 * Refresh the Datanodes to pickup the newly added Namenode by running
   the following command against all the Datanodes in the cluster:
 
-        [hdfs]$ $HADOOP_PREFIX/bin/hdfs dfsadmin -refreshNameNode <datanode_host_name>:<datanode_rpc_port>
+        [hdfs]$ $HADOOP_PREFIX/bin/hdfs dfsadmin -refreshNameNodes <datanode_host_name>:<datanode_rpc_port>
 
 Managing the cluster
 --------------------
@@ -208,7 +208,7 @@ These commands can be run from any node where the HDFS configuration is availabl
 
 The Balancer has been changed to work with multiple Namenodes. The Balancer can be run using the command:
 
-    [hdfs]$ $HADOOP_PREFIX/sbin/hadoop-daemon.sh --config $HADOOP_CONF_DIR --script $HADOOP_PREFIX/bin/hdfs start balancer [-policy <policy>]
+    [hdfs]$ $HADOOP_PREFIX/sbin/hadoop-daemon.sh start balancer [-policy <policy>]
 
 The policy parameter can be any of the following:
 
@@ -219,7 +219,7 @@ The policy parameter can be any of the following:
   level which also balances at the Datanode level.
 
 Note that Balancer only balances the data and does not balance the namespace.
-For the complete command usage, see [balancer](../hadoop-common/CommandsManual.html#balancer).
+For the complete command usage, see [balancer](./HDFSCommands.html#balancer).
 
 ### Decommissioning