HADOOP-11955. Fix a typo in the cluster setup doc. Contributed by Yanjun Wang.

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -740,6 +740,9 @@ Release 2.8.0 - UNRELEASED
     HADOOP-12014. hadoop-config.cmd displays a wrong error message.
     (Kengo Seki via aajisaka)
 
+    HADOOP-11955. Fix a typo in the cluster setup doc.
+    (Yanjun Wang via aajisaka)
+
 Release 2.7.1 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-common-project/hadoop-common/src/site/markdown/ClusterSetup.md

@@ -66,7 +66,7 @@ Additionally, you can control the Hadoop scripts found in the bin/ directory of
 
 To configure the Hadoop cluster you will need to configure the `environment` in which the Hadoop daemons execute as well as the `configuration parameters` for the Hadoop daemons.
 
-HDFS daemons are NameNode, SecondaryNameNode, and DataNode. YARN damones are ResourceManager, NodeManager, and WebAppProxy. If MapReduce is to be used, then the MapReduce Job History Server will also be running. For large installations, these are generally running on separate hosts.
+HDFS daemons are NameNode, SecondaryNameNode, and DataNode. YARN daemons are ResourceManager, NodeManager, and WebAppProxy. If MapReduce is to be used, then the MapReduce Job History Server will also be running. For large installations, these are generally running on separate hosts.
 
 ### Configuring Environment of Hadoop Daemons