Javadoc fixes

git-svn-id: http://svn.apache.org/repos/asf/commons/proper/dbcp@1509323 13f79535-47bb-0310-9956-ffa450edef68
Java 7. Use <>

git-svn-id: http://svn.apache.org/repos/asf/commons/proper/dbcp@1509326 13f79535-47bb-0310-9956-ffa450edef68