docs: Correct pin interrupt example code for the WiPy.

Author: danicampora

docs/library/machine.Pin.rst

@@ -24,7 +24,7 @@ Usage Model:
  print(pin.id())
 
  pin_int = Pin('GP10', mode=Pin.IN, pull=Pin.PULL_DOWN)
- pin_int.irq(mode=Pin.IRQ_RISING, handler=pincb)
+ pin_int.irq(trigger=Pin.IRQ_RISING, handler=pincb)
  # the callback can be triggered manually
  pin_int.irq()()
  # to disable the callback