MAPREDUCE-3718. Amending incorrect JIRA number in CHANGES.txt

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1236358 13f79535-47bb-0310-9956-ffa450edef68

hadoop-mapreduce-project/CHANGES.txt

@@ -220,7 +220,7 @@ Release 0.23.1 - Unreleased
     MAPREDUCE-3512. Batching JobHistory flushing to DFS so that we don't flush
     for every event slowing down AM. (Siddarth Seth via vinodkv)
 
-    MAPREDUCE-3712. Change default AM heartbeat interval to 1 second. (Hitesh
+    MAPREDUCE-3718. Change default AM heartbeat interval to 1 second. (Hitesh
     Shah via sseth)
 
   BUG FIXES