API "Getting Started" guide missing crucial step of changing app key

I just tried to set up a test app using the “Getting Started” guide, and kept getting an error “An app with this key already exists” error when trying to register my app.

After searching through the configuration files, I found out that I have to change the “key” key in atlassian-connect.json before I can register the app, which wasn’t mentioned anywhere in the guide. It should be, because as written the guide is broken.