[docs] add plat-infra-if and api-border-routing doxygen groups (#7898)

doc/ot_api_doc.h

@@ -102,6 +102,7 @@
  * @defgroup api-backbone-router      Backbone Router
  * @defgroup api-border-agent         Border Agent
  * @defgroup api-border-router        Border Router
+ * @defgroup api-border-routing       Border Routing Manager
  * @defgroup api-commissioner         Commissioner
  * @defgroup api-thread-general       General
  * @brief This module includes functions for all Thread roles.
@@ -177,6 +178,7 @@
  * @defgroup plat-time                Time Service
  * @defgroup plat-toolchain           Toolchain
  * @defgroup plat-trel                TREL - Platform
+ * @defgroup plat-infra-if            Infrastructure Interface
  *
  * @}
  *

include/openthread/border_routing.h

@@ -44,7 +44,7 @@ extern "C" {
 #endif
 
 /**
- * @addtogroup api-border-router
+ * @addtogroup api-border-routing
  *
  * @brief
  *  This module includes definitions related to Border Routing Manager.

include/openthread/instance.h

@@ -53,7 +53,7 @@ extern "C" {
  * @note This number versions both OpenThread platform and user APIs.
  *
  */
-#define OPENTHREAD_API_VERSION (225)
+#define OPENTHREAD_API_VERSION (226)
 
 /**
  * @addtogroup api-instance

include/openthread/platform/infra_if.h

@@ -46,6 +46,16 @@
 extern "C" {
 #endif
 
+/**
+ * @addtogroup plat-infra-if
+ *
+ * @brief
+ *   This module includes the platform abstraction for the adjacent infrastructure network interface.
+ *
+ * @{
+ *
+ */
+
 /**
  * This method tells whether an infra interface has the given IPv6 address assigned.
  *
@@ -123,6 +133,11 @@ extern void otPlatInfraIfRecvIcmp6Nd(otInstance *        aInstance,
  */
 extern otError otPlatInfraIfStateChanged(otInstance *aInstance, uint32_t aInfraIfIndex, bool aIsRunning);
 
+/**
+ * @}
+ *
+ */
+
 #ifdef __cplusplus
 } // extern "C"
 #endif