component/bt: Modify some ambiguous descriptions (release v4.2)

components/bt/host/bluedroid/api/include/api/esp_gattc_api.h

@@ -312,7 +312,7 @@ esp_err_t esp_ble_gattc_app_unregister(esp_gatt_if_t gattc_if);
  * @param[in]       gattc_if: Gatt client access interface.
  * @param[in]       remote_bda: remote device bluetooth device address.
  * @param[in]       remote_addr_type: remote device bluetooth device the address type.
- * @param[in]       is_direct: direct connection or background auto connection
+ * @param[in]       is_direct: direct connection or background auto connection(by now, background auto connection is not supported).
  *
  * @return
  *                  - ESP_OK: success

components/bt/include/esp_bt.h

@@ -488,6 +488,7 @@ esp_err_t esp_bt_sleep_disable(void);
  * Note that scan duplicate list will be automatically cleared when the maximum amount of device in the filter is reached
  * the amount of device in the filter can be configured in menuconfig.
  *
+ * @note This function name is incorrectly spelled, it will be fixed in release 5.x version.
  *
  * @return
  *                  - ESP_OK : success