Update control-interface.md

Remove erroneous information.

Author: Jocke4f

docs/docs/usage/control-interface.md

@@ -24,16 +24,4 @@ You can also manually edit that file.
 
 **Make sure that TallyArbiter is closed while making changes, because otherwise they will be overwritten!**
 
-You can change the security of the settings and the producer page by adding or replacing the following section to your `config.json` file:
-
-```javascript
-{
-	"security":
-	{
-		"username_settings": "admin",
-		"password_settings": "12345",
-		"username_producer": "producer",
-		"password_producer": "12345"
-	}
-}
-```
+On the settings page can the settings be exported/imported to/from a file via the configuration interface.