fix for --pull-policy flag in kim blog post

Signed-off-by: Batuhan Apaydın <[email protected]>

Author: developer-guy

_posts/2021-05-12-kim.md

@@ -138,7 +138,7 @@ Now install OpenFaaS and set the image pull policy for functions to "IfNotPresen
 
 ```bash
 arkade install openfaas \
-  --pull-policy IfNotPresent
+  --set faasnetes.imagePullPolicy=IfNotPresent
 ```
 
 Run the commands given to you to start port-forwarding the OpenFaaS gateway and to log in. If you forget the commands just type `arkade info openfaas` to get them back again.