docs: def returner_argspec(module=''):
      '''
      Return the argument specification of functions in Salt returner
      modules.
  
      .. versionadded:: 2015.5.0
  
      CLI Example:
  
      .. code-block:: bash
  
          salt '*' sys.returner_argspec xmpp
          salt '*' sys.returner_argspec xmpp smtp
          salt '*' sys.returner_argspec
  
      Returner names can be specified as globs.
  
      .. code-block:: bash
  
          salt '*' sys.returner_argspec 'sqlite3.*'
  
      '''
      returners_ = salt.loader.returners(__opts__, [])
      return salt.utils.args.argspec_report(returners_, module)