Add STUN to upnp documentation

e.g. wiki page
https://openwrt.org/docs/guide-user/firewall/upnp/miniupnpd
does not document STUN mode at all while it is very useful where passthrough is not available, only DMZ/FULLCONE/CGNAT replacements are
Like user figured out themselves here:

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every time i reboot my router i have to disable and enable stun to work again...is there a way to fix that

Ouch clicked in wrong place, You should open a new topic, showing boot and restart logs, adding a line here if upnp stun can be made any better.

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