corrected Jira reference for HADOOP-6527

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1@1365462 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -398,7 +398,7 @@ Release 1.1.0 - unreleased
     HDFS-3551. WebHDFS CREATE should use client location for HTTP redirection.
     (szetszwo)
 
-    HDFS-6527. Backport HADOOP-7389: Use of TestingGroups by tests causes
+    HADOOP-6527. Backport HADOOP-7389: Use of TestingGroups by tests causes
     subsequent tests to fail.  (Ivan Mitic via szetszwo)
 
     HDFS-8417. HADOOP-6963 didn't update hadoop-core-pom-template.xml