Wiki article http://www.jboss.org/community/docs/DOC-9975 is linked from http://www.jboss.org/community/docs/DOC-10207 (from the 'Support for passivation to disk of clustered web sessions' link) but its "Incoming Links" section has no trace of it.

It does show an incoming link from http://www.jboss.org/community/docs/DOC-12414 which is correct (the link being called 'How to enable http session passivation in 5.0? ')