fix(learn): Remove errors discovered while following Angular todo lis…

…t app Guide (#32132)

* Added changes to remove errors discovered while following instructions.

Imported CommonModule (could only import NgFor instead) and set app component as standalone. Without importing NgFor, ngForOf won't bind to li used in the template. Angular expects the component to be standalone. There could be better ways to fix this, I'm writing this while going through the tutorial.

* Update files/en-us/learn/tools_and_testing/client-side_javascript_frameworks/angular_todo_list_beginning/index.md

Co-authored-by: Onkar Ruikar <[email protected]>

---------

Co-authored-by: Onkar Ruikar <[email protected]>
Co-authored-by: Brian Thomas Smith <[email protected]>

files/en-us/learn/tools_and_testing/client-side_javascript_frameworks/angular_todo_list_beginning/index.md

@@ -92,8 +92,11 @@ In `app.component.ts`, replace the contents with the following:
 
 ```js
 import { Component } from "@angular/core";
+import { CommonModule } from "@angular/common";
 
 @Component({
+  standalone: true,
+  imports: [CommonModule],
   selector: "app-root",
   templateUrl: "./app.component.html",
   styleUrls: ["./app.component.css"],