Updated EmptyFlags code example

Signed-off-by: Andre Wanlin <awanlin@rapidrtc.com>

.changeset/nine-wombats-talk.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-user-settings': patch
+---
+
+Updated example code for registering feature flags in the `EmptyFlags` component

plugins/user-settings/src/components/FeatureFlags/EmptyFlags.tsx

@@ -22,9 +22,7 @@ const EXAMPLE = `import { createPlugin } from '@backstage/core-plugin-api';
 
 export default createPlugin({
   id: 'plugin-name',
-  register({ router, featureFlags }) {
-    featureFlags.register('enable-example-feature');
-  },
+  featureFlags: [{ name: 'enable-example-feature' }],
 });
 `;