acpi: Update mentions of s2idle in comments

We use the explicit "suspend-to-idle" name now.

Sponsored by:	The FreeBSD Foundation

sys/compat/linuxkpi/common/src/linux_acpi.c

@@ -126,7 +126,7 @@ linux_handle_power_suspend_event(void *arg __unused, enum power_stype stype)
 		/*
 		 * XXX: obiwac Not 100% sure this is correct, but
 		 * acpi_target_sleep_state does seem to be set to
-		 * ACPI_STATE_S3 during s2idle on Linux.
+		 * ACPI_STATE_S3 during suspend-to-idle (aka s2idle) on Linux.
 		 */
 		linux_acpi_target_sleep_state = ACPI_STATE_S3;
 		pm_suspend_target_state = PM_SUSPEND_TO_IDLE;

sys/dev/acpi_support/acpi_ibm.c

@@ -1449,8 +1449,8 @@ acpi_ibm_eventhandler(struct acpi_ibm_softc *sc, int arg)
 	switch (arg) {
 	/*
 	 * XXX "Suspend-to-RAM" here is as opposed to suspend-to-disk, but it is
-	 * fine if our suspend sleep state transition request puts us in s2idle
-	 * instead of suspend-to-RAM.
+	 * fine if our suspend sleep state transition request puts us in
+	 * suspend-to-idle instead of actual suspend-to-RAM.
 	 */
 	case IBM_EVENT_SUSPEND_TO_RAM:
 		(void)power_pm_suspend(POWER_TRANSITION_SUSPEND);