refactor(docs-infra): remove unnecessary use strict from docs examples TS files (#38143)

By default, TypeScript will emit `"use strict"` directives, so it is not
necessary to include `'use strict'` in `.ts` files:
https://www.typescriptlang.org/docs/handbook/compiler-options.html#:~:text=--noImplicitUseStrict

PR Close #38143

aio/content/examples/upgrade-phonecat-2-hybrid/app/app.module.ajs.ts

@@ -1,6 +1,4 @@
 // #docregion
-'use strict';
-
 // Define the `phonecatApp` AngularJS module
 angular.module('phonecatApp', [
   'ngAnimate',