Use realistic KMS key ID format in example

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-1:123456789012:key/abc-123',
+    kmsKeyId: 'arn:aws:kms:us-east-1:123456789012:key/12345678-1234-1234-1234-123456789012',
   },
 };
 ```