This patch adapts Installing additional desktop environments page for
Fedora 41, i.e. DNF5.
This patch also fixes other pages which use DNF4 group commands to use
canonical DNF4 syntax. The correct syntax is easier to transit to DNF5
syntax. The patch explicitly does not convert other pages to DNF5
syntax because they usually refer to groups and environements which
does not exist anymore in recent Fedoras.
https://bugzilla.redhat.com/show_bug.cgi?id=2333129
Locally it rendered for me with the title of the target document, however when
deployed it rendered with the filename of the target document. So include the
document titles explicitly instead.
* Improve messaging regarding N->N+2 upgrades.
* Move some details regarding Rawhide issues to the specific Rawhide wiki page.
This generic guide doesn't need to go into detail about Rawhide issues,
because that makes it harder to read for general users (not interested in
Rawhide). Power users can follow a link.
* Update gnome-software screenshot (more recent, with graphics).
* Clearly state that upgrading using pure `dnf` or `fedora-upgrade` is
unsupported.
* Other small adjustments and clarifications, link fixes. Make section headlines
look consistent across articles (don't capitalize every word).
