Updated Hardware API (markdown)

Hardware-API.md

@@ -334,7 +334,7 @@ Methods:
 - `machine.sleep([... options])` NOHEAP; enter sleep mode that retains RAM and continues execution when woken
 - `machine.deepsleep([... options])` NOHEAP; enter sleep mode that may not retain RAM and may reset when woken
 - `machine.reset_cause()` get the reset cause
-- `machine.wake_reason()` get the wake reason, might return `None` if now sleep-wake cycle has occurred ??
+- `machine.wake_reason()` get the wake reason, will return `None` if now sleep-wake cycle has occurred
 
 ### Constants