Merge pull request kubernetes-sigs#340 from claudenm/a-few-example-cl…

…arifications

A few example clarifications

docs/walkthrough.md

@@ -31,7 +31,7 @@ In this example, you'll
 		  value: us-west-1
 		```
 
-	 - `CLUSTER_NAME`: name of the cluster. 
+	 - `CLUSTER_NAME`: name of the cluster.
 
 		```yaml
 		- name: CLUSTER_NAME
@@ -108,16 +108,24 @@ In this example, you'll
 	wget https://raw.githubusercontent.com/coreos/alb-ingress-controller/master/examples/echoservice/echoserver-ingress.yaml
 	```
 
-1. Alter the host field to a domain that you own in Route 53
-
-	Assuming you managed `example.com` in Route 53.
+1. Edit the alb.ingress.kubernetes.io/subnets annotation to include at least two subnets.  If you'd like to use external dns, alter the host field to a domain that you own in Route 53. Assuming you managed `example.com` in Route 53. *Note:* The security group you specify must have public http access on port 80.
 
 	```yaml
-	spec:
-	  rules:
-	  - host: echoserver.example.com
-        http:
-          paths:
+    apiVersion: extensions/v1beta1
+    kind: Ingress
+    metadata:
+      name: echoserver
+      namespace: echoserver
+      annotations:
+        alb.ingress.kubernetes.io/scheme: internet-facing
+        alb.ingress.kubernetes.io/subnets: subnet-1, subnet-2
+        alb.ingress.kubernetes.io/security-groups: sg-1
+        alb.ingress.kubernetes.io/tags: Environment=dev,Team=test
+    spec:
+      rules:
+      - host: echoserver.example.com
+          http:
+            paths:
 	```
 
 1. Add tags to subnets where ALBs should be deployed.

examples/alb-ingress-controller.yaml

@@ -71,7 +71,7 @@ spec:
           # Maximum number of times to retry the aws calls.
           # defaults to 20.
         - name: AWS_MAX_RETRIES
-          value: 20
+          value: "20"
         - name: POD_NAME
           valueFrom:
             fieldRef: