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

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1196967 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -728,7 +728,7 @@ Release 0.23.0 - 2011-11-01
     HADOOP-7770. ViewFS getFileChecksum throws FileNotFoundException for files in 
     /tmp and /user. (Ravi Prakash via jitendra)
 
-    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