Fix typo. Update docs.
Fix typo. Update docs.

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