docs: restart service after changing system.conf
docs: restart service after changing system.conf

Signed-off-by: Sijmen Huizenga <1584d08817184edea547cf1c53d59f0494469237@gmail.com>

jluebbe/rauc,rauc/rauc,ejoerns/rauc,ejoerns/rauc,ejoerns/rauc,jluebbe/rauc,rauc/rauc,jluebbe/rauc,rauc/rauc