code: func (c *Context) EditMessagesTextWithEventID(eventID string, text string) (edited int, err error) {
  	var messages []OutgoingMessage
  	//update MAX_MSGS_TO_UPDATE_WITH_EVENTID last bot messages
  	c.db.C("messages").Find(bson.M{"botid": c.Bot().ID, "eventid": eventID}).Sort("-_id").Limit(MaxMsgsToUpdateWithEventID).All(&messages)
  	for _, message := range messages {
  		err = c.EditMessageText(&message, text)
  		if err != nil {
  			c.Log().WithError(err).WithField("eventid", eventID).Error("EditMessagesTextWithEventID")
  		} else {
  			edited++
  		}
  	}
  	return edited, err
  }
docs: // EditMessagesTextWithEventID edit the last MaxMsgsToUpdateWithEventID messages' text with the corresponding eventID  in ALL chats