Mistake in SPI documentation example

There is a small mistake in the SPI documentation in the example "Example: communication with a SPI device and an extra GPIO":

Line 61 in 16398f3

# Get GPIO port to manage extra pins, use A*BUS4 as GPO, A*BUS4 as GPI

Should instead say:

# Get GPIO port to manage extra pins, use A*BUS4 as GPO, A*BUS5 as GPI

Also the example would be clearer if it used parameter names for the set_direction call:

Line 63 in 16398f3

gpio.set_direction(0x30, 0x10)

Would become:

gpio.set_direction(pins=0b0011_0000, direction=0b0001_0000)

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