Changed format to follow the Thoughtbot style guide for the Getting_Started.md

One thing I did not change was the following code.

>email { "#{ first_name }.#{ last_name }@example.com".downcase }

I intentionally did not put a space before or after the curly brackets. that are inside quotation marks. That would change how it looks. so I guess there are exceptions to the space before and space curly brackets.