HADOOP-10602. Documentation has broken "Go Back" hyperlinks. Contributed by Akira AJISAKA.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1598337 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10602. Correct CHANGES.txt.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1598339 13f79535-47bb-0310-9956-ffa450edef68