The EAP Installation Guide in the following section
http://www.redhat.com/docs/en-US/JBoss_Enterprise_Application_Platform/5.0.0/html-single/Installation_Guide/index.html#migration.change.jars

it points to the release notes giving this link
http://www.redhat.com/docs/en-US/JBoss_Enterprise_Application_Platform/5.0.0/html-single/Release_Notes/index.html

There are no HTML formats for the release notes in the online documentation
http://www.redhat.com/docs/en-US/JBoss_Enterprise_Application_Platform/

the correct link to be referenced is
http://www.redhat.com/docs/en-US/JBoss_Enterprise_Application_Platform/5.0.0/pdf/Release_Notes_GA/Release_Notes.pdf