Fixed incorrect documentation reference to COPersistentRoot

git-svn-id: http://svn.gna.org/svn/etoile/trunk/Etoile/Frameworks/CoreObject@10214 7b3f36aa-e6db-49c1-8b4c-66eac1997e64
Fixed and improved API documentation ouput in Model classes

git-svn-id: http://svn.gna.org/svn/etoile/trunk/Etoile/Frameworks/CoreObject@10215 7b3f36aa-e6db-49c1-8b4c-66eac1997e64