ACPICA: Fix a typo in a comment field

ACPICA commit f3504c591c8766c70402dcc786391ff6748b515a

Link: https://github.com/acpica/acpica/commit/f3504c59


Reported-by: Christophe Jaillet <christophe.jaillet@wanadoo.fr>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Erik Kaneda <erik.kaneda@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>