Add template pull instruction

Signed-off-by: Vivek Sridhar <[email protected]>

Author: --global

docs/deployment/kubernetes.md

@@ -125,7 +125,11 @@ There are currently no sample functions built into this stack, but we can deploy
       name: faas
       gateway: http://192.168.4.95:31112
     ```
+    Before deploying the gateway changes make sure you pull the [templates from GitHub:](https://github.com/openfaas/templates)
 
+    ```bash
+    $ faas-cli template pull
+    ```
     Now deploy the samples:
 
     ```bash