code: func (s *PullRequestsService) GetComment(ctx context.Context, owner string, repo string, commentID int64) (*PullRequestComment, *Response, error) {
  	u := fmt.Sprintf("repos/%v/%v/pulls/comments/%d", owner, repo, commentID)
  	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", mediaTypeReactionsPreview)
  
  	comment := new(PullRequestComment)
  	resp, err := s.client.Do(ctx, req, comment)
  	if err != nil {
  		return nil, resp, err
  	}
  
  	return comment, resp, nil
  }
docs: // GetComment fetches the specified pull request comment.
  //
  // GitHub API docs: https://developer.github.com/v3/pulls/comments/#get-a-single-comment