Update BluetoothAdapter and BluetoothDevice documentation

Update BluetoothAdapter#startDiscovery and
BluetoothDevice#fetchUuidsWithSdp documentation to
indicate that it queues the request if a device is
currently bonding

Tag: #feature
Bug: 187165224
Test: Manual
Merged-In: I3dbcdacff062f6c33c2fdc8d64170bf60b2fbf6f
Change-Id: I7e598417ba96a5acc9f13fb6d29a0612740f31b4