docs(accordion): add wrapping div
docs(accordion): add wrapping div

Closes #6139

icfantv/bootstrap,looker/bootstrap,Servoy/bootstrap,byronigoe/bootstrap,byronigoe/bootstrap,vfiles/bootstrap,fpipita/bootstrap,BookingBug/bootstrap,looker/bootstrap,caoruiy/bootstrap,icfantv/bootstrap,shootermv/bootstrap,angular-ui/bootstrap,Kpler/bootstrap,RobJacobs/bootstrap,RobJacobs/bootstrap,BookingBug/bootstrap,Kpler/bootstrap,vfiles/bootstrap,shootermv/bootstrap,angular-ui/bootstrap,caoruiy/bootstrap,fpipita/bootstrap,Servoy/bootstrap