Fix wrong edge conf documentation

README.md

@@ -104,11 +104,11 @@ Running edge as a service
 
 edge can also be run as a service instead of cli:
 
-1. Edit `/etc/n2n/edge` with your custom options. See `/etc/n2n/edge.conf.sample`.
+1. Edit `/etc/n2n/edge.conf` with your custom options. See `/etc/n2n/edge.conf.sample`.
 2. Start the service: `sudo systemctl start edge`
 3. Optionally enable edge start on boot: `sudo systemctl enable edge`
 
-You can run multiple edge service instances by creating `/etc/n2n/edge-instance1` and
+You can run multiple edge service instances by creating `/etc/n2n/edge-instance1.conf` and
 starting it with `sudo systemctl start edge@instance1`.
 
 IPv6 Support