docs-bug(General): Aria banners visible on Material docs

### Documentation Feedback

I think these are meant for the CDK pages but they are visible on Material pages as well

<img width="1080" height="260" alt="Image" src="https://github.com/user-attachments/assets/c698a397-bf51-4b4f-9df8-297037539e75" />

### Affected documentation page

https://material.angular.dev/components/menu/overview