nmi_watchdog is set to NMI_NONE by default (ie disabled) on _any_
mode so lets fix documentation too.
Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Cc: "Maciej W. Rozycki" <macro@linux-mips.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>