Fix docs on user:group ownership of /etc/matchbox
@@ -159,6 +159,7 @@ Move TLS credentials to the matchbox server's default location.
```sh
$ sudo mkdir -p /etc/matchbox
$ sudo cp ca.crt server.crt server.key /etc/matchbox
+$ sudo chown -R matchbox:matchbox /etc/matchbox
```
Save `client.crt`, `client.key`, and `ca.crt` for later use (e.g. `~/.matchbox`).
