code: func (c *Client) DeleteCertAuthority(id services.CertAuthID) error {
  	if err := id.Check(); err != nil {
  		return trace.Wrap(err)
  	}
  	_, err := c.Delete(c.Endpoint("authorities", string(id.Type), id.DomainName))
  	return trace.Wrap(err)
  }
docs: // DeleteCertAuthority deletes cert authority by ID