overlays: gpio-fan: Document the hyst parameter
See: https://forums.raspberrypi.com/viewtopic.php?t=339143 Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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See: https://forums.raspberrypi.com/viewtopic.php?t=339143 Signed-off-by: Phil Elwell <phil@raspberrypi.com>