Ubuntu uses netplan not /etc/network/interfaces

This bug tracker is for errors with the documentation, use the following as a template and remove or add fields as you see fit. Convert [ ] into [x] to check boxes:

- [X] This doc is inaccurate in this way: Recent versions of Ubuntu uses netplan to configure networks not /etc/network/interfaces
- [ ] This is a doc addition request.
- [ ] I have a fix to the document that I can paste below including example: input and output.

If you have a troubleshooting or support issue, use the following resources:

 - The mailing list: https://lists.openstack.org
 - IRC: 'openstack' channel on OFTC

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Release: on 2023-06-23 01:43:36
SHA: c801c8bcbb12a142ef9a410d983c79bd46783908
Source: https://opendev.org/openstack/openstack-manuals/src/doc/install-guide/source/environment-networking-controller.rst
URL: https://docs.openstack.org/install-guide/environment-networking-controller.html