JDiff output for release 1.2.1

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.2@1510328 13f79535-47bb-0310-9956-ffa450edef68
corrected minor typo in CHANGES.txt

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.2@1510332 13f79535-47bb-0310-9956-ffa450edef68