watchdog/hardlockup: remove softlockup comment in touch_nmi_watchdog()

watchdog/hardlockup: remove softlockup comment in touch_nmi_watchdog()

In the patch ("watchdog/hardlockup: add comments to touch_nmi_watchdog()")
we adjusted some comments for touch_nmi_watchdog().  The comment about the
softlockup had a typo and were also felt to be too obvious.  Remove it.

Link: https://lkml.kernel.org/r/20230526184139.5.Ia593afc9eb12082d55ea6681dc2c5a89677f20a8@changeid
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Suggested-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>