Update hello-minikube.md

When I ran `kubectl get deployments`, it showed no available nodes. So I thought I did something wrong. Eventually I ran it again and it matched the expected output. So, I would like to add a helpful hint to the documentation.

content/en/docs/tutorials/hello-minikube.md

@@ -114,6 +114,8 @@ recommended way to manage the creation and scaling of Pods.
     hello-node   1/1     1            1           1m
     ```
 
+    (It may take some time for the pod to become available. If you see "0/1", try again in a few seconds.)
+
 1. View the Pod:
 
     ```shell