unify all service yaml: use 2 spaces indent (#4754)

docs/tasks/access-application-cluster/configure-cloud-provider-firewall.md

@@ -26,8 +26,8 @@ metadata:
   name: myapp
 spec:
   ports:
-    - port: 8765
-      targetPort: 9376
+  - port: 8765
+    targetPort: 9376
   selector:
     app: example
   type: LoadBalancer
@@ -44,8 +44,8 @@ metadata:
   name: myapp
 spec:
   ports:
-    - port: 8765
-      targetPort: 9376
+  - port: 8765
+    targetPort: 9376
   selector:
     app: example
   type: LoadBalancer

docs/tasks/access-application-cluster/frontend.yaml

@@ -7,9 +7,9 @@ spec:
     app: hello
     tier: frontend
   ports:
-    - protocol: "TCP"
-      port: 80
-      targetPort: 80
+  - protocol: "TCP"
+    port: 80
+    targetPort: 80
   type: LoadBalancer
 ---
 apiVersion: apps/v1beta1
@@ -26,9 +26,9 @@ spec:
         track: stable
     spec:
       containers:
-        - name: nginx
-          image: "gcr.io/google-samples/hello-frontend:1.0"
-          lifecycle:
-            preStop:
-              exec:
-                command: ["/usr/sbin/nginx","-s","quit"]
+      - name: nginx
+        image: "gcr.io/google-samples/hello-frontend:1.0"
+        lifecycle:
+          preStop:
+            exec:
+              command: ["/usr/sbin/nginx","-s","quit"]

docs/tasks/access-application-cluster/hello-service.yaml

@@ -7,6 +7,6 @@ spec:
     app: hello
     tier: backend
   ports:
-    - protocol: TCP
-      port: 80
-      targetPort: http
+  - protocol: TCP
+    port: 80
+    targetPort: http