[arm-allstar] Portable node howto update

[Doug Crompton]

I have updated the portable node howto at hamvoip.org with another example
that shows how to use a portable router access point to to set up wireless
on the Pi while on the road.


*73 Doug*

*WA3DSP*

*http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*