Fix DBCP-410
Correct path to Javadoc overview in build.xml.
Patch by Andreas Sturmlechner

git-svn-id: http://svn.apache.org/repos/asf/commons/proper/dbcp@1566539 13f79535-47bb-0310-9956-ffa450edef68
Update date

git-svn-id: http://svn.apache.org/repos/asf/commons/proper/dbcp@1566540 13f79535-47bb-0310-9956-ffa450edef68