[DOCS] External Authentication System documentation incorrect example for runner module args

Description
The External Authentication System documentation on limiting by function arguments gives an incorrect example for specifying runner module args:

external_auth:
  pam:
    my_user:
      - '@runner':
        - 'runner_mod.*':
            args:
            - 'a.*'
            - 'b.*'
            kwargs:
              'kwa': 'kwa.*'
              'kwb': 'kwb'

This is also contradicted by the rest_cherrypy documentation which states:

LocalClient also takes arg (array) and kwarg (dictionary) arguments because these values are sent to the Minions and used to execute the requested function there. RunnerClient and WheelClient are executed directly on the Master and thus do not need or accept those arguments.
"Runners do not support positional args"

Suggested Fix
I have tested this extensively and found that this config will work:

external_auth:
  pam:
    my_user:
      - '@runner':
        - 'runner_mod.*':
            'kwa': 'kwa.*'
            'kwb': 'kwb'

Type of documentation
Salt documentation

Location or format of documentation
https://docs.saltproject.io/en/master/topics/eauth/index.html#limiting-by-function-arguments

Open the External Authentication System documentation at the stated “Limiting by function arguments” location and compare its runner module example with the tested configuration in the issue. Update the example so runner arguments use the documented keyword mapping, and ensure it no longer contradicts the rest_cherrypy guidance about runner arguments.