thermal: gov_step_wise: Clarify cooling logic description comment

The cooling logic description comment next to the get_target_state()
definition is slightly ambiguous in what it means by "lower cooling
state", so clarify that by replacing the ambuguous phrase with "the
minimum applicable cooling state".

No functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Link: https://patch.msgid.link/4690596.LvFx2qVVIh@rafael.j.wysocki

Author: rafaeljw

drivers/thermal/gov_step_wise.c

@@ -23,8 +23,8 @@
  *    b. if the trend is THERMAL_TREND_DROPPING, do nothing
  * If the temperature is lower than a trip point,
  *    a. if the trend is THERMAL_TREND_RAISING, do nothing
- *    b. if the trend is THERMAL_TREND_DROPPING, use lower cooling
- *       state for this trip point, if the cooling state already
+ *    b. if the trend is THERMAL_TREND_DROPPING, use the minimum applicable
+ *       cooling state for this trip point, or if the cooling state already
  *       equals lower limit, deactivate the thermal instance
  */
 static unsigned long get_target_state(struct thermal_instance *instance,