Hostname guide improvements (keycloak#21846)

* changed hostname.adoc

Closes keycloak#20931

Signed-off-by: Peter Zaoral <[email protected]>
Co-authored-by: Steven Hawkins <[email protected]>, Václav Muzikář <[email protected]>

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