Add commented out busio import

Author: tekktrik

examples/gps_satellitefix.py

@@ -15,6 +15,7 @@
 # a slightly higher timeout (GPS modules typically update once a second).
 # These are the defaults you should use for the GPS FeatherWing.
 # For other boards set RX = GPS module TX, and TX = GPS module RX pins.
+# import busio
 # uart = busio.UART(board.TX, board.RX, baudrate=9600, timeout=10)
 
 # for a computer, use the pyserial library for uart access