docs(aio): add NgModule docs (#20306)

PR Close #20306

aio/content/examples/ngmodule-faq/src/app/app.module.3.ts

@@ -0,0 +1,41 @@
+// #docplaster
+// #docregion
+/* Angular Imports */
+import { NgModule }           from '@angular/core';
+import { BrowserModule }      from '@angular/platform-browser';
+
+/* App Imports */
+// #enddocregion
+import { AppComponent }       from './app.component.3';
+/*
+// #docregion
+import { AppComponent }       from './app.component';
+// #enddocregion
+*/
+// #docregion
+import { HighlightDirective } from './highlight.directive';
+import { TitleComponent }     from './title.component';
+import { UserService }        from './user.service';
+
+/* Routing Module */
+// #enddocregion
+import { AppRoutingModule }   from './app-routing.module.3';
+/*
+// #docregion
+import { AppRoutingModule }   from './app-routing.module';
+// #enddocregion
+*/
+// #docregion
+
+@NgModule({
+// #docregion imports
+  imports:      [
+    BrowserModule,
+    AppRoutingModule
+  ],
+// #enddocregion imports
+  providers:    [ UserService ],
+  declarations: [ AppComponent, HighlightDirective, TitleComponent ],
+  bootstrap:    [ AppComponent ]
+})
+export class AppModule { }