correction: /bin/sh -c added without which JOB was never getting completed (dgkanatsios#274)

Co-authored-by: Manmohan Krishna <[email protected]>

Author: krishna1m

c.pod_design.md

@@ -670,7 +670,7 @@ version-2
 <p>
 
 ```bash
-kubectl create job pi  --image=perl -- perl -Mbignum=bpi -wle 'print bpi(2000)'
+kubectl create job pi  --image=perl -- /bin/sh -c perl -Mbignum=bpi -wle 'print bpi(2000)'
 ```
 
 </p>