ACPI: PM: s2idle: Fix comment in acpi_s2idle_prepare_late()

Fix a comment in acpi_s2idle_prepare_late() that has become outdated
after commit f0ac20c ("ACPI: EC: Fix flushing of pending work").

Fixes: f0ac20c ("ACPI: EC: Fix flushing of pending work")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/sleep.c

@@ -982,10 +982,7 @@ static int acpi_s2idle_prepare_late(void)
 
 static void acpi_s2idle_sync(void)
 {
-	/*
-	 * The EC driver uses the system workqueue and an additional special
-	 * one, so those need to be flushed too.
-	 */
+	/* The EC driver uses special workqueues that need to be flushed. */
 	acpi_ec_flush_work();
 	acpi_os_wait_events_complete(); /* synchronize Notify handling */
 }