Added 2 lines on browser functionality

I feel that this was also missing from the HTML/CSS intro class.
Understanding that the browser has to download the files from the 'server' is sometimes key in understanding how it all links together.
Fixed typo for 'accordians'

Fixed the typo of 'accordians' on the show-hide interaction
Merge pull request #1 from TeckniX/patch-1

Added 2 lines on browser functionality