sample-app: Fix port of node-server-svc (80 to 8080)

Without this, following the instructions that don't require port
forwarding (e.g. using "minikube tunnel") fails: the service is exposed
on port 80, which is not what the frontend expects.

After this commit the setup mimics that of the frontend service, which
works both with and without port forwarding.

Signed-off-by: Guzman <guzman@guzman.fi>

code-samples/eventing/bookstore-sample-app/solution/node-server/config/100-deployment.yaml

@@ -29,6 +29,6 @@ spec:
     app: node-server
   ports:
     - protocol: TCP
-      port: 80
+      port: 8080
       targetPort: 8000
   type: LoadBalancer

code-samples/eventing/bookstore-sample-app/start/node-server/config/100-deployment.yaml

@@ -29,6 +29,6 @@ spec:
     app: node-server
   ports:
     - protocol: TCP
-      port: 80
+      port: 8080
       targetPort: 8000
   type: LoadBalancer

docs/versioned/bookstore/page-0.5/environment-setup.md

@@ -278,7 +278,7 @@ node-server-svc          LoadBalancer   10.101.90.35    <pending>     80:31792/T
 If port forwarding is required, open a new terminal and run:
 
 ```shell
-kubectl port-forward svc/node-server-svc 8080:80
+kubectl port-forward svc/node-server-svc 8080:8080
 ```
 You should see the following output: