detail: Update comment on RaiseException
detail: Update comment on RaiseException

The original comment isn't valid anymore since the mentioned bug has
been fixed by now, but we still need the function because
the current mp_obj_new_exception_msg assumes the string passed to it
has a lifetime exceeding the raising of the exception.

stinos/micropython-wrap,stinos/micropython-wrap,stinos/micropython-wrap