Fix code review feedback: health check example and KMS ARN format

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

content/docs/references/integration/connector-file-storage.mdx

@@ -204,7 +204,7 @@ const s3Connector: FileStorageConnector = {
   encryption: {
     enabled: true,
     algorithm: 'aws:kms',
-    kmsKeyId: 'arn:aws:kms:us-east-1:123456789:key/abc-123',
+    kmsKeyId: 'arn:aws:kms:us-east-1:123456789012:key/abc-123',
   },
 };
 ```

content/docs/references/system/startup-orchestrator.mdx

@@ -66,7 +66,7 @@ Configuration for plugin startup orchestration.
 const options: StartupOptions = {
   timeout: 30000,
   rollbackOnFailure: true,
-  healthCheck: false,
+  healthCheck: true, // Enable health checks for production
   parallel: false
 };
 ```