Updated Internal Load Balancer annotation for GCP

Author: Pranav-Thorve

content/en/docs/concepts/services-networking/service.md

@@ -771,7 +771,7 @@ Select one of the tabs.
 metadata:
     name: my-service
     annotations:
-        cloud.google.com/load-balancer-type: "Internal"
+        networking.gke.io/load-balancer-type: "Internal"
 [...]
 ```