code: public Note comment(long id, String text)
  	{
  		if(text.isEmpty())
  		{
  			throw new IllegalArgumentException("comment must not be empty");
  		}
  
  		SingleElementHandler<Note> noteHandler = new SingleElementHandler<>();
  		makeSingleNoteRequest(id, "comment", text, new NotesParser(noteHandler));
  		return noteHandler.get();
  	}
docs: @param id id of the note
  @param text comment to be added to the note. Must not be null or empty
  
  @throws OsmConflictException if the note has already been closed.
  @throws OsmAuthorizationException if this application is not authorized to write notes
  (Permission.WRITE_NOTES)
  @throws OsmNotFoundException if the note with the given id does not exist (anymore)
  
  @return the updated commented note