MAPREDUCE-6122. Fix CHANGES.txt.

(cherry picked from commit 2f0166db560b180e8d07c10ba9ad4bfaf2aa7b36)

hadoop-mapreduce-project/CHANGES.txt

@@ -195,7 +195,7 @@ Release 2.6.0 - UNRELEASED
     MAPREDUCE-6029. TestCommitterEventHandler fails in trunk (Mit Desai via
     jlowe)
 
-    MAPREDUCE-6029. TestLineRecordReader may fail due to test data files checked
+    MAPREDUCE-6122. TestLineRecordReader may fail due to test data files checked
     out of git with incorrect line endings. (cnauroth)
 
 Release 2.5.1 - 2014-09-05