fix readme

README.md

@@ -119,16 +119,13 @@ custom: []
 **authconfig**
 ```
 # Boolean: enable authentication
-enabled: False
+enable: False
 
 # Path to a htpasswd file
 path :''
 
 # can be 'all' or 'any'
 satisfy: 'all
-
-# example: "https://upstream". If set to None no reverse proxy will be set up.
-backend: None
 ```
 
 **mapsconfig**: