tor-relay-debian.html: torrc needs to be edited as root
A user on twitter had a hard time installing a relay. Main prolbme: permissions to edit the torrc file.
We should make it clearer that this needs root privileges (like the systemctl command).
https://www.torproject.org/docs/tor-relay-debian.html.en
search:
2. Edit the bottom part of /etc/tor/torrc.
replace with:
2. Edit the bottom part of /etc/tor/torrc (as root).