docs(template): improve local variables explanation

Sefibrah · web-flow · commit ef2b85f61500 · 2024-03-04T15:22:23.000+01:00
* Update local-variables.md to include `*ngIf="num$ as n"` [This part of docs](https://www.rx-angular.io/docs/template/concepts/local-variables) was unclear to me (at first glance). There are many approaches to give it clarity. My suggestion is to include `*ngIf="num$ as n"` as well. * docs: update unclear explanation of async pipe usage
diff --git a/apps/docs/docs/template/concepts/local-variables.md b/apps/docs/docs/template/concepts/local-variables.md
@@ -15,7 +15,9 @@ Both ways can reduce the usage of pipes the `async` pipe (or any other pipe).
 **With `async` pipe**
 
 ```html
-<ng-container> {{ n | async }} {{ n | async}} {{ n | async}} </ng-container>
+<ng-container *ngIf="num$ as n">
+  {{ n | async }} {{ n | async}} {{ n | async}}
+</ng-container>
 ```
 
 **With `*rxLet` directive**
