doc: network: update example

Only display Ethernet and WLAN devices (not loopback, bridges etc).

doc/yambar-modules-network.5.scd

@@ -101,11 +101,17 @@ address per network interface.
 
 # EXAMPLES
 
+Display all Ethernet (including WLAN) devices. This excludes loopback,
+bridges etc.
+
 ```
 bar:
   left:
     - network:
         content:
+          map:
+            conditions:
+              type == ether || type == wlan:
                 map:
                   default:
                     string: {text: "{name}: {state} ({ipv4})"}