docs: update module.ngdoc Hello World example

Helpful for people new to Angular to see the ng-app declaration in context with the expression example. This will help illustrate the "Important thing to notice" point which follows: "The reference to myApp module in <html ng-app="myApp">. This is what bootstraps the app using your module."
I've landed a fix for the e2e bugs you were getting. So can I get you to change this very slightly, to make it `ng-app-included="true"` instead? We need a value, otherwise the template engine doesn't know that there's a value for it.

Also fix the indentation a bit and see if the tests are green, we should be okay to merge it after thast