Update learn more link for attention requests

- This changes the learn more link to point to the feature docs pages so users can understand more about the feature.
- https://gitlab.com/gitlab-org/gitlab/-/merge_requests/83873

app/assets/javascripts/attention_requests/components/navigation_popover.vue

@@ -82,7 +82,9 @@ export default {
       return 'bottom';
     },
   },
-  docsPage: helpPagePath('development/code_review.html'),
+  docsPage: helpPagePath('user/project/merge_requests/index.md', {
+    anchor: 'request-attention-to-a-merge-request',
+  }),
 };
 </script>