code: func (s *RepositoriesService) EditReleaseAsset(ctx context.Context, owner, repo string, id int64, release *ReleaseAsset) (*ReleaseAsset, *Response, error) {
  	u := fmt.Sprintf("repos/%s/%s/releases/assets/%d", owner, repo, id)
  
  	req, err := s.client.NewRequest("PATCH", u, release)
  	if err != nil {
  		return nil, nil, err
  	}
  
  	asset := new(ReleaseAsset)
  	resp, err := s.client.Do(ctx, req, asset)
  	if err != nil {
  		return nil, resp, err
  	}
  	return asset, resp, nil
  }
docs: // EditReleaseAsset edits a repository release asset.
  //
  // GitHub API docs: https://developer.github.com/v3/repos/releases/#edit-a-release-asset