docs: def help(opts, bot, _):
      """Usage: help [<command>]
  
      With no arguments, print the form of all supported commands.
      With an argument, print a detailed explanation of a command.
      """
      command = opts['<command>']
      if command is None:
          return bot.help_text()
  
      if command not in bot.commands:
          return "%r is not a known command" % command
  
      return bot.commands[command].__doc__