Bluetooth: Doc: Update doxygen groups

Move top most level Bluetooth subsystem related APIs (enable, disable,
etc.) under 'bluetooth' group, and rest under 'bt_gap' group.

Signed-off-by: Omkar Kulkarni <[email protected]>

Author: omkar3141

include/zephyr/bluetooth/bluetooth.h

@@ -45,6 +45,12 @@
 extern "C" {
 #endif
 
+/**
+ * @defgroup bt_host Bluetooth Host
+ * @ingroup bluetooth
+ * @{
+ */
+
 /**
  * @brief Generic Access Profile (GAP)
  *
@@ -59,7 +65,7 @@ extern "C" {
  * @defgroup bt_gap Generic Access Profile (GAP)
  * @since 1.0
  * @version 1.0.0
- * @ingroup bluetooth
+ * @ingroup bt_host
  * @{
  */
 
@@ -285,6 +291,16 @@ struct bt_le_ext_adv_cb {
 #endif /* defined(CONFIG_BT_PER_ADV_RSP) */
 };
 
+/**
+ * bt_gap
+ * @}
+ */
+
+/**
+ * bt_host
+ * @}
+ */
+
 /**
  * @typedef bt_ready_cb_t
  * @brief Callback for notifying that Bluetooth has been enabled.
@@ -342,6 +358,11 @@ int bt_disable(void);
  */
 bool bt_is_ready(void);
 
+/**
+ * @addtogroup bt_gap
+ * @{
+ */
+
 /**
  * @brief Set Bluetooth Device Name
  *
@@ -3126,6 +3147,7 @@ int bt_le_per_adv_set_response_data(struct bt_le_per_adv_sync *per_adv_sync,
 bool bt_le_bond_exists(uint8_t id, const bt_addr_le_t *addr);
 
 /**
+ * bt_gap
  * @}
  */