Update Quick Start Guide output example

[rayjsales]

In the Quick Start Guide, under Create a New Application section, the output example can be updated to reflect the current version and be consistent with other guides. Currently, in the guide the output shows:

Livereload server on http://localhost:7020
Serving on http://localhost:4200/

The line Livereload server on http://localhost:7020 does not look applicable in the current version.

Also, the Orientation Guide in the Starting and Stopping the Development Server section reflects the current version better. For reference, the Orientation guide looks like this:

$ npm start

> [email protected] start
> ember serve

building... 

Build successful (9761ms) – Serving on http://localhost:4200/

Recommend updating the Quick Start Guide to be more consistent with the Orientation Guide and the current version. In the Quick Start Guide, the output can be updated to:

$ npm start

> [email protected] start
> ember serve

building... 

Build successful (9761ms) – Serving on http://localhost:4200/

I would like to create a pull request for this change on the guide if needed.