HADOOP-7343. Corrected ref to wrong jira number in CHANGES.txt, from commit r1132794

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.20-security@1167406 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -121,7 +121,7 @@ Release 0.20.205.0 - unreleased
     MAPREDUCE-2705. Implements launch of multiple tasks concurrently.
     (Thomas Graves via ddas)
 
-    MAPREDUCE-7343. Make the number of warnings accepted by test-patch
+    HADOOP-7343. Make the number of warnings accepted by test-patch
     configurable to limit false positives. (Thomas Graves via cdouglas)
 
     HDFS-1836. Thousand of CLOSE_WAIT socket. Contributed by Todd Lipcon,