Updated to include Windows tools (#650)

Instead of `grep` which is not deployed with Windows by default, converted code to use built-in `find` tool.
Also added a step to reduce possible installation issues

Author: edokan

docs/k8s-docker-for-windows.md

@@ -60,7 +60,7 @@ the box to enable Kubernetes.
 ### Configuring OpenWhisk
 
 You will be using a NodePort ingress to access OpenWhisk. Assuming
-`kubectl describe nodes | grep InternalIP` returns 192.168.65.3 and
+`kubectl describe nodes | find "InternalIP"` returns 192.168.65.3 and
 port 31001 is available to be used on your host machine, a
 mycluster.yaml for a standard deployment of OpenWhisk would be:
 
@@ -77,6 +77,10 @@ nginx:
 
 ### Using helm to install OpenWhisk
 
+Installation expects `openwhisk` namespace to be created. To create, run
+
+`kubectl create namespace openwhisk`
+
 Indicate the Kubernetes worker nodes that should be used to execute user
 containers by OpenWhisk's invokers. For a single node development cluster,
 simply run: