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/resolution-modifiers/src/app/app.module.ts

@@ -1,4 +1,3 @@
-;
 import { OptionalComponent } from './optional/optional.component';
 import { NgModule } from '@angular/core';
 import { BrowserModule } from '@angular/platform-browser';