docs/advanced: fix script URL
docs/advanced: fix script URL

Signed-off-by: Vyacheslav Yurkov <8eaf04ce5753f91ad2c4b34a782af05a6fbd24bc@gmail.com>

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