docs(c48): refactor (2)

Author: svenson95

docs/src/content/docs/challenges/forms/48-avoid-losing-form-data.md

@@ -34,8 +34,6 @@ Here's the feature expressed as a user story with a functional expectation:
 
 <details>
  <summary>Tips 🤫 if you really need it and after careful consideration ...</summary>
- <ul>
  * Use the [Material CDK](https://material.angular.io/cdk/) Dialog or Overlay - dont forget to add `@import '@angular/cdk/overlay-prebuilt.css'` in `styles.scss`.
  * Use the [CanDeactivate](https://angular.io/api/router/CanDeactivate) guard in the new functional approach.
- </ul>
 </details>