EZP-21619: Updated INI doc for redirectAfterPublish feature

See http://jira.ez.no/browse/EZP-21619

Not much here. The redirect code only knows about the published object, not the edited node. The reference node is obtained using $object->mainNode(), and that means that node & mainNode are equivalent.

Clarified by removing the mainNode value from the doc, and mentioned that the redirect node is always based on the main location.