Add note about needing ng-app="myApp" in Step 5

Request Type: docs

How to reproduce:

Component(s): misc core

Impact: small

Complexity: small

This issue is related to:

Detailed Description:

This document was how I learned about using the inline, anonymous controller definition. It took me a long time and much frustration to figure out that I needed to change ng-app in my markup in order for this to work. I'm hoping to save some time for the next person who takes the same path as me.

Other Comments: