Adding dedupe usage docs
Adding dedupe usage docs

JedWatson/classnames,StephenGrider/classnames,beni55/classnames,ento/classnames,JedWatson/classnames,kwangkim/classnames,fattenap/classnames,victor-homyakov/classnames,JedWatson/classnames,longlho/classnames,victor-homyakov/classnames