You must be reading really old documentation. Everything has been rolled into "pf" now. There is only one configuration file (it looks like you're reading a how-to that is very old and describes the setup before NAT and packet filtering were combine).
use this link instead
If you want to just NAT all inside IPs to your outside IP, then you want something like
nat on rl0 from 192.168.1.0/24 to any -> (rl0)
I should point out that you only use the (interface) notation if that interface's IP is dynamic. If you have a static external IP, then just use rl0 without the parenthesis.