YARN-1877. Updated CHANGES.txt to fix the JIRA number. It was previously committed as YARN-2010.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1599349 13f79535-47bb-0310-9956-ffa450edef68

hadoop-yarn-project/CHANGES.txt

@@ -108,7 +108,7 @@ Release 2.5.0 - UNRELEASED
     YARN-2054. Better defaults for YARN ZK configs for retries and retry-inteval 
     when HA is enabled. (kasha)
 
-    YARN-2010. Document yarn.resourcemanager.zk-auth and its scope. 
+    YARN-1877. Document yarn.resourcemanager.zk-auth and its scope. 
     (Robert Kanter via kasha)
 
     YARN-2115. Replaced RegisterNodeManagerRequest's ContainerStatus with a new