code: func (as *AnnotationStream) Normalize() error {
  	if err := as.Project.Validate(); err != nil {
  		return errors.Annotate(err, "Invalid project name: %s", as.Project).Tag(grpcutil.InvalidArgumentTag).Err()
  	}
  
  	if err := as.Path.Validate(); err != nil {
  		return errors.Annotate(err, "Invalid log stream path %q", as.Path).Tag(grpcutil.InvalidArgumentTag).Err()
  	}
  
  	return nil
  }
docs: // Normalize validates and normalizes the stream's parameters.