code: func (s *ChangesService) ChangeFileContentInChangeEdit(changeID, filePath, content string) (*Response, error) {
  	u := fmt.Sprintf("changes/%s/edit/%s", changeID, url.QueryEscape(filePath))
  
  	req, err := s.client.NewRawPutRequest(u, content)
  	if err != nil {
  		return nil, err
  	}
  
  	return s.client.Do(req, nil)
  }
docs: // ChangeFileContentInChangeEdit put content of a file to a change edit.
  //
  // When change edit doesn’t exist for this change yet it is created.
  // When file content isn’t provided, it is wiped out for that file.
  // As response “204 No Content” is returned.
  //
  // Gerrit API docs: https://gerrit-review.googlesource.com/Documentation/rest-api-changes.html#put-edit-file