code: func addKnownTypes(scheme *runtime.Scheme) error {
  	scheme.AddKnownTypes(SchemeGroupVersion,
  		&ValidatingWebhookConfiguration{},
  		&ValidatingWebhookConfigurationList{},
  		&MutatingWebhookConfiguration{},
  		&MutatingWebhookConfigurationList{},
  	)
  	return nil
  }
docs: // Adds the list of known types to scheme.