overlays: Clarify gpio-poweroff semantics in README
1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: https://github.com/raspberrypi/linux/issues/1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: https://github.com/raspberrypi/linux/issues/1600