Update prototyping-utilities.md
Update prototyping-utilities.md

Removed 'hi-fi'
abdullahsalem/foundation-sites,abdullahsalem/foundation-sites,zurb/foundation,denisahac/foundation-sites,zurb/foundation,DaSchTour/foundation-sites,denisahac/foundation-sites,zurb/foundation-sites,zurb/foundation-sites,abdullahsalem/foundation-sites,DaSchTour/foundation-sites,zurb/foundation-sites,zurb/foundation,denisahac/foundation-sites