Troubleshooting: Changing FXTI can cause issues on Windows

@patrickelectric mentioned that on Windows machines changing the FXTI creates a new network, which then can't be assigned the correct IP until the old network has it removed, but old network devices are not displayed in the normal place - need to access via device manager.

Start in the ArduSub GitBook troubleshooting documentation and investigate the Windows behavior described when changing FXTI. Document how to find the old network device through Device Manager and address the resulting IP-assignment problem. Done when the troubleshooting guidance clearly explains this recovery path for Windows users.

Written by the indexing model from the issue text.