Changes

: This is an asynchronous method and its result is returned via a Promise. If the stopDiscovery operation succeeds, an [[B2G/Bluetooth/WebBluetooth-v2/BluetoothAdapter#onattributechanged|onattributechanged]] would be triggered before the Promise is resolved to indicate property [[B2G/Bluetooth/WebBluetooth-v2/BluetoothAdapter#discovering|adapter.discovering]] becomes false. Note adapter may still receive [[B2G/Bluetooth/WebBluetooth-v2/BluetoothDiscoveryHandle#ondevicefound|BluetoothDiscoveryHandle.ondevicefound]] event until the Promise is resolved.