Update ssh.md

docs/servers/ssh.md

@@ -18,6 +18,7 @@ You then need to enable the SSH server in your `config.hjson`:
 		ssh: {
                     enabled: true
 		    port: 8889
+		    privateKeyPem: /path/to/ssh_private_key.pem
                     privateKeyPass: YOUR_PK_PASS
         }                                                             
     }