Update docs
Update docs

Clarify relation between direct and default imports.
reactjs/history,reactjs/history,pucka/history,mjackson/history,ReactJSTraining/history,knowbody/history,narr/history,narr/history,pucka/history,ReactJSTraining/history,rackt/history,jesenko/history,narr/history,PactCoffee/history,PactCoffee/history,jesenko/history,knowbody/history,mjackson/history,iam4x/history,knowbody/history,PactCoffee/history,iam4x/history,rackt/history,jesenko/history,pucka/history,ReactTraining/history,iam4x/history