code: func (validatingWebhookConfigurationStrategy) ValidateUpdate(ctx context.Context, obj, old runtime.Object) field.ErrorList {
  	return validation.ValidateValidatingWebhookConfigurationUpdate(obj.(*admissionregistration.ValidatingWebhookConfiguration), old.(*admissionregistration.ValidatingWebhookConfiguration))
  }
docs: // ValidateUpdate is the default update validation for an end user.