docs: edit $any() section and add example in Template Syntax (#28157)

PR Close #28157

aio/content/examples/built-in-template-functions/src/app/app.component.html

@@ -0,0 +1,15 @@
+<h1>{{title}}</h1>
+
+<h2><code>$any( )</code> type cast function and an undeclared member</h2>
+
+<p>There is no such member as <code>bestByDate</code> in the following two examples, so nothing renders:</p>
+<!-- #docregion any-type-cast-function-1 -->
+<p>The item's undeclared best by date is: {{$any(item).bestByDate}}</p>
+<!-- #enddocregion any-type-cast-function-1 -->
+
+<h2>using <code>this</code></h2>
+<!-- #docregion any-type-cast-function-2 -->
+<p>The item's undeclared best by date is: {{$any(this).bestByDate}}</p>
+<!-- #enddocregion any-type-cast-function-2 -->
+
+

aio/content/examples/built-in-template-functions/src/app/app.component.spec.ts

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+import { TestBed, async } from '@angular/core/testing';
+import { AppComponent } from './app.component';
+describe('AppComponent', () => {
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [
+        AppComponent
+      ],
+    }).compileComponents();
+  }));
+  it('should create the app', async(() => {
+    const fixture = TestBed.createComponent(AppComponent);
+    const app = fixture.debugElement.componentInstance;
+    expect(app).toBeTruthy();
+  }));
+});

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

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+import { Component } from '@angular/core';
+
+@Component({
+  selector: 'app-root',
+  templateUrl: './app.component.html',
+  styleUrls: ['./app.component.css']
+})
+export class AppComponent {
+  title = 'Built-in Template Functions';
+
+  item = {
+    name : 'Telephone',
+    origin : 'Sweden',
+    price: 98
+  };
+}

aio/content/examples/built-in-template-functions/src/app/app.module.ts

@@ -0,0 +1,18 @@
+import { BrowserModule } from '@angular/platform-browser';
+import { NgModule } from '@angular/core';
+
+
+import { AppComponent } from './app.component';
+
+
+@NgModule({
+  declarations: [
+    AppComponent
+  ],
+  imports: [
+    BrowserModule
+  ],
+  providers: [],
+  bootstrap: [AppComponent]
+})
+export class AppModule { }