This is a followup change to address PR 231977: we need to mention that /etc/pf.conf does not exist by default.
I'm having a bit of trouble coming up with a proper change/wording in /head/libexec/rc/rc.conf. Removing the line
pf_rules="/etc/pf.conf" # rules definition file for pf
would be wrong, as it still is the default location for the file, even if it does not exist there by default. What would be a good way to say that in the comment? Something like
pf_rules="/etc/pf.conf" # rules definition file for pf (nonexistent by default)