code: func (k *KeyManager) RemoveKey(key string) (*KeyResponse, error) {
  	return k.RemoveKeyWithOptions(key, nil)
  }
docs: // RemoveKey handles broadcasting a key to the cluster for removal. Each member
  // will receive this event, and if they have the key in their keyring, remove
  // it. If any errors are encountered, RemoveKey will collect and relay them.