Merge pull request #30182 from Miaoxiang-philips/patch-2

Fix missing import for `createServiceFactory` in backend plugin API example

docs/backend-system/core-services/root-health.md

@@ -12,7 +12,11 @@ The Root Health service provides some health check endpoints for the backend. By
 The following example shows how you can override the root health service implementation.
 
 ```ts
-import { RootHealthService, coreServices } from '@backstage/backend-plugin-api';
+import {
+  RootHealthService,
+  coreServices,
+  createServiceFactory,
+} from '@backstage/backend-plugin-api';
 
 const backend = createBackend();