Update web.yaml

Change the container image of the Statefulset in the first document(application/web/web.yaml ) to registry.k8s.io/nginx-slim:0.7

Author: tomoaki-ii

content/en/examples/application/web/web.yaml

@@ -29,7 +29,7 @@ spec:
     spec:
       containers:
       - name: nginx
-        image: registry.k8s.io/nginx-slim:0.8
+        image: registry.k8s.io/nginx-slim:0.7
         ports:
         - containerPort: 80
           name: web