fix(ble/bluedroid): Fixed bluedroid host get white list size error

(cherry picked from commit f4dfd42725)

Co-authored-by: zhiweijian <zhiweijian@espressif.com>

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

@@ -3088,6 +3088,7 @@ esp_err_t esp_ble_gap_clear_whitelist(void);
 
 /**
 * @brief            Get the whitelist size in the controller
+*                   Note: This API returns a constant value indicating the maximum number of whitelists supported by the controller
 *
 * @param[out]       length: the white list length.
 * @return