Document Events for Login/Logout

[jensens]

they are missing in https://5.docs.plone.org/develop/addons/components/events.html#event-types see also https://stackoverflow.com/questions/43852342/is-there-some-logout-hook-in-plone-4/43853802#43853802

[tobiasherp]

There should be a sentence about handling event interfaces vs. event classes as well.

[jensens]

Indeed, the example here https://5.docs.plone.org/develop/addons/components/events.html#subscribing-using-zcml uses the event class. This works, but best practice is to use the event interface.