Update instruction for getting token to work on vanilla k8s and opens…

…hift (#1264)

docs/user/getting-started.md

@@ -37,7 +37,7 @@ To retrieve the token,
 ### On Linux/macOS:
 
 ```bash
-kubectl get secret $(kubectl get serviceaccount kubeapps-operator -o jsonpath='{.secrets[].name}') -o jsonpath='{.data.token}' -o go-template='{{.data.token | base64decode}}' && echo
+kubectl get secret $(kubectl get serviceaccount kubeapps-operator -o jsonpath='{range .secrets[*]}{.name}{"\n"}{end}' | grep kubeapps-operator-token) -o jsonpath='{.data.token}' -o go-template='{{.data.token | base64decode}}' && echo
 ```
 
 ### On Windows: