style(docs-infra): fix docs examples for tslint rule semicolon (#38143)

This commit updates the docs examples to be compatible with the
`semicolon` tslint rule.

This is in preparation of updating the docs examples `tslint.json` to
match the one generated for new Angular CLI apps in a future commit.

PR Close #38143

aio/content/examples/built-in-directives/src/app/app.component.ts

@@ -84,7 +84,7 @@ export class AppComponent implements OnInit {
   }
 
   resetList() {
-    this.resetItems()
+    this.resetItems();
     this.itemsWithTrackByCountReset = 0;
     this.itemsNoTrackByCount = ++this.itemsNoTrackByCount;
   }