Add mention of KNewStuffCore and KNewStuffQuick to the base documentation, and expand the API documentation to mention some of the new functionality, as well as add some documentation for things which currently lack it. Prior to this, the documentation had no mention of the way the framework is now logically split up.
This deficiency was brought to my attention during a chat with a GSoC student, who was otherwise in the process of disregarding KNewStuff and headed towards reimplementing large parts of KNewStuffCore (as the documentation makes no suggestion this is now a thing that can be used on its own).