Corrected documentation of post_group and fire_group
Corrected documentation of post_group and fire_group

... to avoid confusion between giving the name of a group of peers, or a list of peers.

gattazr/cohorte-herald,librallu/cohorte-herald,ahmadshahwan/cohorte-herald,ahmadshahwan/cohorte-herald,gattazr/cohorte-herald,librallu/cohorte-herald,isandlaTech/cohorte-herald,librallu/cohorte-herald,gattazr/cohorte-herald,isandlaTech/cohorte-herald,isandlaTech/cohorte-herald,ahmadshahwan/cohorte-herald