Fixed subnetworkRef name in example

Signed-off-by: Rickard von Essen <[email protected]>

examples/networkconnectivity/v1beta1/serviceconnectionpolicy.yaml

@@ -16,7 +16,7 @@ spec:
     pscConfig:
       limit: "2"
       subnetworksRefs:
-      - name: producer_subnet
+      - name: producer-subnet
     serviceClass: gcp-memorystore-redis
 
 ---
@@ -49,4 +49,4 @@ spec:
     networkSelector:
       matchLabels:
         testing.upbound.io/example-name: producer_net
-    region: us-central1
+    region: us-central1