PM: EM: fix kernel-doc comments

Fix the kernel-doc comments for the improved Energy Model documentation.
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

include/linux/energy_model.h

@@ -11,7 +11,7 @@
 #include <linux/types.h>
 
 /**
- * em_perf_state - Performance state of a performance domain
+ * struct em_perf_state - Performance state of a performance domain
  * @frequency:	The frequency in KHz, for consistency with CPUFreq
  * @power:	The power consumed at this level (by 1 CPU or by a registered
  *		device). It can be a total power: static and dynamic.
@@ -25,7 +25,7 @@ struct em_perf_state {
 };
 
 /**
- * em_perf_domain - Performance domain
+ * struct em_perf_domain - Performance domain
  * @table:		List of performance states, in ascending order
  * @nr_perf_states:	Number of performance states
  * @milliwatts:		Flag indicating the power values are in milli-Watts
@@ -103,12 +103,12 @@ void em_dev_unregister_perf_domain(struct device *dev);
 
 /**
  * em_cpu_energy() - Estimates the energy consumed by the CPUs of a
-		performance domain
+ *		performance domain
  * @pd		: performance domain for which energy has to be estimated
  * @max_util	: highest utilization among CPUs of the domain
  * @sum_util	: sum of the utilization of all CPUs in the domain
  * @allowed_cpu_cap	: maximum allowed CPU capacity for the @pd, which
-			  might reflect reduced frequency (due to thermal)
+ *			  might reflect reduced frequency (due to thermal)
  *
  * This function must be used only for CPU devices. There is no validation,
  * i.e. if the EM is a CPU type and has cpumask allocated. It is called from