HADOOP-7798. Fixed jira number in CHANGES.txt.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1196966 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -798,7 +798,7 @@ Release 0.23.0 - 2011-11-01
 
     HADOOP-7778. FindBugs warning in Token.getKind(). (tomwhite)
 
-    HADOOP-7789. Add support gpg signatures for maven release artifacts.
+    HADOOP-7798. Add support gpg signatures for maven release artifacts.
     (cutting via acmurthy) 
 
 Release 0.22.0 - Unreleased