Corrected kiosk mode config

[log1-c]

Only got the documented steps to work if the [autologin] part was added, so I suppose it is missing from this documentation

[nilmerg]

Please drop the example and link to 05-Authentication.md#authentication-configuration-external-authentication instead. I also don't see a need for the configuration path here.

And please capitalize the first word of a new sentence. ;)

[log1-c]

@nilmerg
Added the link (though I personally don't see the benefit of "jumping" to another docs page for just two lines of code).
Full path was used because it is used everywhere else in this docs page as well.

[nilmerg]

Well, ok, but the link points to the main location where external auth is described. In case the config ever changes, it's just a single place to update.

[nilmerg]

Eh, and thank you :D