code: def complete_command_help(self, tokens: List[str], text: str, line: str, begidx: int, endidx: int) -> List[str]:
          
          for idx, token in enumerate(tokens):
              if idx >= self._token_start_index:
                  if self._positional_completers:
                      # For now argparse only allows 1 sub-command group per level
                      # so this will only loop once.
                      for completers in self._positional_completers.values():
                          if token in completers:
                              return completers[token].complete_command_help(tokens, text, line, begidx, endidx)
                          else:
                              return self._cmd2_app.basic_complete(text, line, begidx, endidx, completers.keys())
          return []
docs: Supports the completion of sub-commands for commands through the cmd2 help command.