applications: gesture_recognition: fix doxygen grouping

Add doxygen group for all GR related symbols.

Signed-off-by: Szymon Antkowiak <szymon.antkowiak@nordicsemi.no>

Author: Szynkaa

applications/gesture_recognition/src/ble/ble_common.h

@@ -4,7 +4,10 @@
  * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
  */
 
-/** @defgroup ble BLE interface for GR */
+/**
+ * @defgroup ble BLE interface for GR
+ * @ingroup app_gr
+ */
 
 /**
  *

applications/gesture_recognition/src/hw_modules/common.h

@@ -4,7 +4,10 @@
  * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
  */
 
-/** @defgroup hw_modules HW modules for GR */
+/**
+ * @defgroup hw_modules HW modules for GR
+ * @ingroup app_gr
+ */
 
 /**
  *

applications/gesture_recognition/src/inference_postprocessing.h

@@ -4,6 +4,14 @@
  * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
  */
 
+/**
+ * @defgroup app_gr Gesture Recognition Application
+ *
+ * @defgroup inference_postprocessing Inference Postprocessing
+ * @{
+ * @ingroup app_gr
+ */
+
 #ifndef __INFERENCE_POSTPROCESSING_H__
 #define __INFERENCE_POSTPROCESSING_H__
 
@@ -52,3 +60,7 @@ const char *inference_get_class_name(const class_label_t class_label);
 
 
 #endif /* __INFERENCE_POSTPROCESSING_H__ */
+
+/**
+ * @}
+ */

applications/gesture_recognition/src/uxsm/ux_state_manager.h

@@ -7,6 +7,7 @@
 /**
  * @defgroup uxsm UX State Machine
  * @{
+ * @ingroup app_gr
  *
  * uxsm means ux_state_machine.
  *