Fix leading spaces in kubectl commands

This is causing bash/zsh shells to not to record the executed command in the
history. See this link for details: https://unix.stackexchange.com/questions/115917/why-is-bash-not-storing-commands-that-start-with-spaces

Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>

docs/tasks/run-application/run-single-instance-stateful-application.md

@@ -85,11 +85,11 @@ for a secure solution.
 
 1. Deploy the contents of the YAML file:
 
-        kubectl create -f https://k8s.io/docs/tasks/run-application/mysql-deployment.yaml
+       kubectl create -f https://k8s.io/docs/tasks/run-application/mysql-deployment.yaml
 
 1. Display information about the Deployment:
 
-        kubectl describe deployment mysql
+       kubectl describe deployment mysql
 
         Name:                 mysql
         Namespace:            default
@@ -108,14 +108,14 @@ for a secure solution.
 
 1. List the pods created by the Deployment:
 
-        kubectl get pods -l app=mysql
+       kubectl get pods -l app=mysql
 
         NAME                   READY     STATUS    RESTARTS   AGE
         mysql-63082529-2z3ki   1/1       Running   0          3m
 
 1. Inspect the Persistent Volume:
 
-        kubectl describe pv mysql-pv
+       kubectl describe pv mysql-pv
 
         Name:            mysql-pv
         Labels:          <none>
@@ -135,7 +135,7 @@ for a secure solution.
 
 1. Inspect the PersistentVolumeClaim:
 
-        kubectl describe pvc mysql-pv-claim
+       kubectl describe pvc mysql-pv-claim
 
         Name:         mysql-pv-claim
         Namespace:    default