code: func (c *Client) DeleteSession(namespace, id string) error {
  	if namespace == "" {
  		return trace.BadParameter(MissingNamespaceError)
  	}
  	_, err := c.Delete(c.Endpoint("namespaces", namespace, "sessions", id))
  	return trace.Wrap(err)
  }
docs: // DeleteSession deletes a session by ID