COMPMID-1008: Fix Doxygen issues

Change-Id: Ie73d8771f85d1f5b059f3a56f1bbd73c98e94a38
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/124723
Reviewed-by: Michalis Spyrou <michalis.spyrou@arm.com>
Tested-by: Jenkins <bsgcomp@arm.com>
diff --git a/tests/framework/instruments/PMU.h b/tests/framework/instruments/PMU.h
index c069a63..1dc41be 100644
--- a/tests/framework/instruments/PMU.h
+++ b/tests/framework/instruments/PMU.h
@@ -64,10 +64,16 @@
     template <typename T>
     T get_value() const;
 
-    /** Open the specified counter based on the default configuration. */
+    /** Open the specified counter based on the default configuration.
+     *
+     * @param[in] config The default configuration.
+     */
     void open(uint64_t config);
 
-    /** Open the specified configuration. */
+    /** Open the specified configuration.
+     *
+     * @param[in] perf_config The specified configuration.
+     */
     void open(const perf_event_attr &perf_config);
 
     /** Close the currently open counter. */