WICKET-6897 Fix the linking of the sources in javadoc
WICKET-6897 Fix the linking of the sources in javadoc

For some reason git didn't included this change in the previous commit

(cherry picked from commit 49db07e8b64bdcd6551518bd0dc4cf8a2f7f44ee)

apache/wicket,apache/wicket,apache/wicket,apache/wicket,mosoft521/wicket,mosoft521/wicket,mosoft521/wicket,mosoft521/wicket,apache/wicket,mosoft521/wicket