update doc

Author: anson627

charts/kwok/README.md

@@ -20,7 +20,12 @@ Set up default stage policy (required)
 > NOTE: This configures the pod/node emulation behavior, if not it will do nothing.
 
 ```shell
-helm upgrade --namespace kwok --install stage-fast stage-fast
+helm upgrade --namespace kwok --install stage ./stage
+```
+
+Set up default node (required)
+```shell
+helm upgrade --namespace kwok --install node ./node
 ```
 
 Set up default metrics usage policy (optional)