make the backend plugin ts files consistent

Signed-off-by: Fredrik Adelöw <freben@gmail.com>

docs/features/kubernetes/installation.md

@@ -60,15 +60,15 @@ add the following:
 ```typescript
 // In packages/backend/src/plugins/kubernetes.ts
 import { KubernetesBuilder } from '@backstage/plugin-kubernetes-backend';
+import { Router } from 'express';
 import { PluginEnvironment } from '../types';
 
-export default async function createPlugin({
-  logger,
-  config,
-}: PluginEnvironment) {
+export default async function createPlugin(
+  env: PluginEnvironment,
+): Promise<Router> {
   const { router } = await KubernetesBuilder.createBuilder({
-    logger,
-    config,
+    logger: env.logger,
+    config: env.config,
   }).build();
   return router;
 }