Better text.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/codec/trunk@1637612 13f79535-47bb-0310-9956-ffa450edef68

Author: garydgregory

src/site/xdoc/index.xml

@@ -99,7 +99,7 @@ See the
 for the latest releases.<br />
 </p>
 <p>
-<a href="changes-report.html">Upgrade notes</a> are also available.
+<a href="changes-report.html">Change reports</a> are also available.
 </p>
 <p>
 For previous releases, see the <a href="http://archive.apache.org/dist/commons/codec/">Apache Archive</a>