Remove incorrect documentation about Person#add_role
Remove incorrect documentation about Person#add_role

sunlightlabs/billy,loandy/billy,openstates/billy,loandy/billy,mileswwatkins/billy,sunlightlabs/billy,mileswwatkins/billy,loandy/billy,openstates/billy,sunlightlabs/billy,mileswwatkins/billy,openstates/billy