docs: fix and improve the description of the default reveal width
docs: fix and improve the description of the default reveal width

denisahac/foundation-sites,jamesstoneco/foundation-sites,DaSchTour/foundation-sites,abdullahsalem/foundation-sites,jamesstoneco/foundation-sites,zurb/foundation-sites,atmmarketing/foundation-sites,abdullahsalem/foundation-sites,atmmarketing/foundation-sites,zurb/foundation-sites,jamesstoneco/foundation-sites,zurb/foundation-sites,colin-marshall/foundation-sites,DaSchTour/foundation-sites,colin-marshall/foundation-sites,zurb/foundation,denisahac/foundation-sites,zurb/foundation,denisahac/foundation-sites,atmmarketing/foundation-sites,abdullahsalem/foundation-sites,zurb/foundation,colin-marshall/foundation-sites