document that even when wakeup_one is used to wakeup, msleep and friends may still return a non-zero value... You are not guaranteed to get a one to one mapping between wakeup_one and zero return values...
document that even when wakeup_one is used to wakeup, msleep and friends
may still return a non-zero value... You are not guaranteed to get a one
to one mapping between wakeup_one and zero return values...

Reviewed by:	kib
MFC after:	3 days

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