postgres DB doc: incorrectly states that password is not needed for (all) guest users

Heya, https://docs.softwareheritage.org/sysadm/data-silos/postgresql/howto-connect.html currently states:

The ~/.pgpass file is not needed for guest (read-only) access to databases. You will only need it for read-write access.

in my experience that is true for some databases, but not for others, which require a guest password for the guest user.

I haven't done a full swipe, but at least the swh-replica service (postgresql-storage-replica host) requires an explicit password when connecting to it from the VPN.

TIA Cheers