Hostname guide improvements (keycloak#21846)

* changed hostname.adoc

Closes keycloak#20931

Signed-off-by: Peter Zaoral <pzaoral@redhat.com>
Co-authored-by: Steven Hawkins <shawkins@redhat.com>, Václav Muzikář <vaclav@muzikari.cz>

Set version to 22.0.1

Set version to 22.0.0

Set version to 21.1.2

Set version to 21.1.1

Set version to 21.1.0

Set version to 21.0.2

Set version to 21.0.1

Set version to 21.0.0

Set version to 20.0.5