docs(tutorial): update step7 ngdoc to fix grammar
docs(tutorial): update step7 ngdoc to fix grammar

This line was missing an 'as'

Previous:
We also have to add the modules dependencies of our app. By listing these two modules as dependencies of `phonecatApp`, ...

New:
We also have to add the modules *as* dependencies of our app.

Closes #8345

ggershoni/angular.js,ggershoni/angular.js,ggershoni/angular.js,ggershoni/angular.js