Fix typo in comments regarding bindEntityEvents proxy & changelog

Noticed some small typos and removed some double spaces
Going through the code I noticed that [Marionette.Controller](https://github.com/marionettejs/backbone.marionette/blob/f55b4db85be6696aefd60054cfd93953504973d8/src/controller.js#L20-21) and [Marionette.Module](https://github.com/marionettejs/backbone.marionette/blob/f55b4db85be6696aefd60054cfd93953504973d8/src/module.js#L33) combine the extend event so I changed this for `Marionette.Object` as well.