Erik Berg e48485b83d Add guide for distribution upgrades to docs
This builds upon a guide which was only included in the docs for
the rocky release.

This has been tested against two deployments running the victoria
release with ubuntu bionic, moving to ubuntu focal.

Change-Id: I13903aed7863d311cf7bc7f7784222785608b3dc
2021-08-18 11:51:39 +01:00
..
2020-12-07 09:17:44 +08:00