Fix CHANGES.txt

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1593473 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6313. WebHdfs may use the wrong NN when configured for multiple HA NNs. Contributed by Kihwal Lee.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1593475 13f79535-47bb-0310-9956-ffa450edef68