fix CHANGES.txt entry for HADOOP 7854

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.0@1206947 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -134,7 +134,7 @@ Release 1.0.0 - 2011.11.27
 
     HDFS-2590. Fix the missing links in the WebHDFS forrest doc.  (szetszwo)
 
-    HDFS-7854. UGI getCurrentUser is not synchronized. (Daryn Sharp via jitendra)
+    HADOOP-7854. UGI getCurrentUser is not synchronized. (Daryn Sharp via jitendra)
 
 Release 0.20.205.0 - 2011.10.06