Documentation issue on Architecture section

On the Architecture section of the documentation, on the JPA persistence layer part, the available options link it is not working, retrieving a HTTP 404 (http://openjpa.apache.org/builds/latest/docs/docbook/manual/ref_guide_dbsetup_dbsupport.html). Not sure, which should be the correct link, but perhaps this one: http://openjpa.apache.org/builds/2.2.1/apache-openjpa/docs/ref_guide_dbsetup_dbsupport.html

If you give me some advice I can fix it
Thanks