fix: markdown

Author: tomalaforge

docs/src/content/docs/challenges/angular/55-back-button-navigation.md

@@ -44,10 +44,14 @@ Some Typescript design patterns, in combination with the Angular features, could
 
 <details>
  <summary>Hint 1</summary>
- Use the `CanDeactivate` functional guard 
+
+Use the `CanDeactivate` functional guard
+
 </details>
 
 <details>
  <summary>Hint 2</summary>
- Material Design dialog documentation can be found [here](https://material.angular.io/components/dialog/overview)
+
+Material Design dialog documentation can be found [here](https://material.angular.io/components/dialog/overview)
+
 </details>