Update documentation.

README.md

@@ -36,12 +36,10 @@ The account data is expected at `~/.sendxmpprc` if no other configuration file l
 
 ```plain
 username: <your_jid>
-jserver: <jabber_server>
-port: <jabber_port>
 password: <your_jabber_password>
 ```
 
-`jserver` and `port` might not be necessary depending on the used server. It is also possible to
+If this is not sufficient to connect you might also specify `jserver` and `port`. It is also possible to
 use a password manager. In this case the `password` setting should be replaced by the `eval_password`
 setting: