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/dependency-injection-in-action/src/app/runners-up.ts

@@ -22,5 +22,5 @@ export function runnersUpFactory(take: number) {
           .join(', ');
 // #docregion factory-synopsis
   };
-};
+}
 // #enddocregion factory-synopsis