docs/library/machine.Pin: Add PULL_HOLD constant to possible pin pulls.
As already mentioned in the docs, not all constants may be available on all
ports, so this is optional to implement.
@@ -235,6 +235,7 @@ not all constants are available on all ports.
.. data:: Pin.PULL_UP
Pin.PULL_DOWN
+ Pin.PULL_HOLD
Selects whether there is a pull up/down resistor. Use the value
``None`` for no pull.
