Move docs on built in Route actions back into the Route documentation

@machty pointed out that with the recent docs move built in route actions like `willTransition` and `error` where showing up on the Controller, Component and Views doc pages. 

This pr removes the mention of `willTransition` and `error` from the `ActionHandler` docs and restores the `actions` docs to the `Route` class. Unfortunately because of how YUI docs work this results in a lot of duplicate documentation which could become a maintenance issue in the future. One alternate could be to document the built-in actions in the Class description instead of at the `actions` level.