Document how to change resource labels in collections (#457)
Document how to change resource labels in collections (#457)

Fixes #456.
BenMorganIO/administrate,dminchev/administrate,vgsantoniazzi/administrate,vgsantoniazzi/administrate,thoughtbot/administrate,joshua5201/administrate,thoughtbot/administrate,thoughtbot/administrate,vgsantoniazzi/administrate,BenMorganIO/administrate,joshua5201/administrate,nando/administrate,dminchev/administrate,nando/administrate,BenMorganIO/administrate,vgsantoniazzi/administrate,dminchev/administrate,nando/administrate,joshua5201/administrate,BenMorganIO/administrate,dminchev/administrate,nando/administrate,joshua5201/administrate,thoughtbot/administrate