code: func GetSecret(c context.Context, k Key) (Secret, error) {
  	if s := Get(c); s != nil {
  		return s.GetSecret(k)
  	}
  	return Secret{}, ErrNoStoreConfigured
  }
docs: // GetSecret is shortcut for grabbing a Store from the context and using its
  // GetSecret method. If the context doesn't have Store set,
  // returns ErrNoStoreConfigured.