Update handling-events.md

It appears that when using a view to handle events this.get('controller') no longer works however this.get('targetObject') does work.

There is a bit more detail here: http://stackoverflow.com/questions/18570805/ember-1-0-0-can-no-longer-access-controller-from-view

I suggest a simple change to line 37 to help... this would need to be checked and applied elsewhere!