[docs] add markup for history tracker (#6932)

doc/ot_api_doc.h

@@ -124,6 +124,7 @@
  * @defgroup api-entropy              Entropy Source
  * @defgroup api-factory-diagnostics  Factory Diagnostics
  * @defgroup api-heap                 Heap
+ * @defgroup api-history-tracker      History Tracker
  * @defgroup api-jam-detection        Jam Detection
  * @defgroup api-logging              Logging
  * @defgroup api-ncp                  Network Co-Processor

include/openthread/history_tracker.h

@@ -35,6 +35,13 @@
 extern "C" {
 #endif
 
+/**
+ * @addtogroup api-history-tracker
+ *
+ * @{
+ *
+ */
+
 /**
  * @brief
  *   This header defines the public API for History Tracker.
@@ -202,6 +209,11 @@ const otHistoryTrackerMessageInfo *otHistoryTrackerIterateTxHistory(otInstance *
  */
 void otHistoryTrackerEntryAgeToString(uint32_t aEntryAge, char *aBuffer, uint16_t aSize);
 
+/**
+ * @}
+ *
+ */
+
 #ifdef __cplusplus
 } // extern "C"
 #endif

include/openthread/instance.h

@@ -53,7 +53,7 @@ extern "C" {
  * @note This number versions both OpenThread platform and user APIs.
  *
  */
-#define OPENTHREAD_API_VERSION (154)
+#define OPENTHREAD_API_VERSION (155)
 
 /**
  * @addtogroup api-instance