updates media query grid class docs
updates media query grid class docs

zurb/ink,zurb/foundation-emails,jsit/foundation-emails,struankl/foundation-emails,jsit/foundation-emails,struankl/foundation-emails,zurb/ink,struankl/foundation-emails,Stadly/foundation-emails,zurb/foundation-emails,Stadly/foundation-emails,struankl/foundation-emails,jsit/foundation-emails,zurb/foundation-emails,jsit/foundation-emails,zurb/foundation-emails,Stadly/foundation-emails,Stadly/foundation-emails