docs: updated to reflect new --config flags

plugins/kubernetes-backend/examples/dice-roller/README.md

@@ -23,7 +23,7 @@ This can be used to run the kubernetes plugin locally against a mock service.
 6. Register existing component in Backstage
    - https://github.com/mclarke47/dice-roller/blob/master/catalog-info.yaml
 
-Update `app-config.development.yaml` as follows.
+Add or update `app-config.local.yaml` with the following:
 
 ```yaml
 kubernetes:
@@ -45,4 +45,4 @@ Mac copy to clipboard:
 kubectl get secret $(kubectl get sa dice-roller -o=json | jq -r .secrets[0].name) -o=json | jq -r '.data["token"]' | base64 --decode | pbcopy
 ```
 
-Paste into `app-config.development.yaml` `kubernetes.clusters[0].serviceAccountToken`
+Paste into `app-config.local.yaml` `kubernetes.clusters[0].serviceAccountToken`