The `dnf upgrade` is better than the `dnf update`. The `dnf update` works, but
it is a deprecated alias of the `upgrade`.
```
$ rpm -q dnf
dnf-4.13.0-1.fc36.noarch
$ man dnf
...
Upgrade Command
Command: upgrade
Aliases: up
Deprecated aliases: update, upgrade-to, update-to, localupdate
...
```
* Migrate some of the content from the old "Bugs and Feature Requests" wiki page
* Add cross references to places that have additional info
* Add a table of contents because gee whiz this page is big
* Encourage people to go to Ask Fedora first, in the hopes that the issue gets solved there and we don't end up with bugs that will just sit until EOL closure.
