Add to "Android BLE issues" information that cancelConnection on Gatt Server does nothing

[farmazon3000]

See http://stackoverflow.com/questions/38762758/bluetoothgattserver-cancelconnection-does-not-cancel-the-connection and https://code.google.com/p/android/issues/detail?id=63461 and http://code.google.com/p/android/issues/detail?id=63464.