Merge pull request #696 from jdegand/bug-cd-md

docs: add note to bug-cd-md

docs/src/content/docs/challenges/angular/32-bug-cd.md

@@ -25,6 +25,10 @@ In this small application, we have a navigation menu to route our application to
 
 The goal of the challenge is to debug this application and make it work.
 
+:::note
+Without knowing the exact reason for the issue, you can "fix" the error and get the program to function. One such approach would be to memoize `getMenu`. The application might work again, but make sure you really understand the problem and its consequences. Making it work isn't always enough; fixing this bug in the wrong way can cause a loss of performance or lead to other problems later on.  
+:::
+
 ## Hints
 
 <details>
@@ -36,6 +40,6 @@ The goal of the challenge is to debug this application and make it work.
 <details>
   <summary>Hint 2</summary>
 
-If you open the [`RouterLinkActive` source code](https://github.com/angular/angular/blob/main/packages/router/src/directives/router_link_active.ts) and go to **line 196**, Angular is calling `this.cdr.markForCheck` inside a microTask which triggers a new CD cycle. If you comment out this line, the application loads again, however the bug is not inside the Angular Framework. 😅😯
+If you open the [`RouterLinkActive` source code](https://github.com/angular/angular/blob/main/packages/router/src/directives/router_link_active.ts) and go to **line 196**, Angular is calling `this.cdr.markForCheck` inside a microTask, which triggers a new CD cycle. If you comment out this line, the application loads again, however, the bug should not be fixed by changing the Angular source code. 😅😯
 
 </details>