Update documentation on display properties.
Update documentation on display properties.

pietgeursen/pietgeursen.github.io,getfrank/tachyons,topherauyeung/portfolio,cwonrails/tachyons,fenderdigital/css-utilities,tachyons-css/tachyons,topherauyeung/portfolio,matyikriszta/moonlit-landing-page,topherauyeung/portfolio,fenderdigital/css-utilities