and the offending link actually is?
"Setting up multiple..." at the bottom.
Not to say it isn't useful; rather, it's not the simplest solution for that task.
BTW, I tried to add some additional comments to the wiki page but apparenly you need special powers.
Thanks for pointing this out. There is a better wiki page -- http://wiki.jboss.org/wiki/Wiki.jsp?page=ConfiguringMultipleJBossInstancesOnOneMachine that the JBossHA page link should point to. I'll fix this.