code: func (c *Client) ServerGroup(identifier string) (*ServerGroup, error) {
  	group := new(ServerGroup)
  	_, err := c.MakeApiRequest("GET", "/1.0/server_groups/"+identifier, nil, group)
  	if err != nil {
  		return nil, err
  	}
  	return group, err
  }
docs: // ServerGroup retrieves a detailed view on one server group