Documentation: Emphasize GPS should output NMEA

[Georacer]

Hi again,

So, I'm reading through the documentation. Here hints that the GPS receiver is to be connected to the onboard computer, not the FC. Okay.

So I go over to ROSFlight to find the driver, specifically: here and here.

These links tell me that the GPS should appear hard-coded at tty/USB0 and be set up to output NMEA sentences at 115200 baud.

I think these settings should be stated somewhere in the documentation, as required for operation.