code: func (resourcequotaStrategy) ValidateUpdate(ctx context.Context, obj, old runtime.Object) field.ErrorList {
  	errorList := validation.ValidateResourceQuota(obj.(*api.ResourceQuota))
  	return append(errorList, validation.ValidateResourceQuotaUpdate(obj.(*api.ResourceQuota), old.(*api.ResourceQuota))...)
  }
docs: // ValidateUpdate is the default update validation for an end user.