docs: Fix syntax in interpolation example (#40554)

Correcting a typo in the example.
PR Close #40554

aio/content/examples/interpolation/src/app/app.component.1.ts

@@ -9,7 +9,7 @@ import { Component } from '@angular/core';
       <h1>Hello, {{customer}}</h1>
       <ul>
         <!-- Ebony and Chiho in a list-->
-        <li *ngFor="let customer of customers"{{ customer.value }}></li>
+        <li *ngFor="let customer of customers">{{ customer.value }}</li>
       </ul>
     </div>
   `