Improve

    (qemu) sync-profile of
    Error: Invalid parameter 'of'

to

    Error: invalid parameter 'of', expecting 'on', 'off', or 'reset'

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20231031111059.3407803-3-armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Dr. David Alan Gilbert <dave@treblig.org>