FAQ: add bullseye's supported architectures
Not sure if it's best to link to https://www.freexian.com/lts/debian/, https://www.freexian.com/lts/debian/details/ or nothing at all
Not sure if it's best to link to https://www.freexian.com/lts/debian/, https://www.freexian.com/lts/debian/details/ or nothing at all