code: func (s *TeamsService) ListComments(ctx context.Context, teamID int64, discussionNumber int, options *DiscussionCommentListOptions) ([]*DiscussionComment, *Response, error) {
  	u := fmt.Sprintf("teams/%v/discussions/%v/comments", teamID, discussionNumber)
  	u, err := addOptions(u, options)
  	if err != nil {
  		return nil, nil, err
  	}
  
  	req, err := s.client.NewRequest("GET", u, nil)
  	if err != nil {
  		return nil, nil, err
  	}
  
  	// TODO: remove custom Accept header when this API fully launches.
  	req.Header.Set("Accept", mediaTypeTeamDiscussionsPreview)
  
  	var comments []*DiscussionComment
  	resp, err := s.client.Do(ctx, req, &comments)
  	if err != nil {
  		return nil, resp, err
  	}
  
  	return comments, resp, nil
  }
docs: // ListComments lists all comments on a team discussion.
  // Authenticated user must grant read:discussion scope.
  //
  // GitHub API docs: https://developer.github.com/v3/teams/discussion_comments/#list-comments