docs(guide/scope): correct scopes example
docs(guide/scope): correct scopes example

Remove reference to `employee` property as it's not used in the example.
Inject and use `$rootScope` applying `department` property as mentioned in text.

Closes #4839

ammula88/angular.js,ammula88/angular.js,ammula88/angular.js,ammula88/angular.js,ammula88/angular.js