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

PR Close #28157

aio/content/examples/built-in-template-functions/e2e/src/app.e2e-spec.ts

@@ -0,0 +1,20 @@
+'use strict'; // necessary for es6 output in node
+
+import { browser, element, by } from 'protractor';
+
+describe('Built Template Functions Example', function () {
+  beforeAll(function () {
+    browser.get('');
+  });
+
+  it('should have title Built-in Template Functions', function () {
+    let title = element.all(by.css('h1')).get(0);
+    expect(title.getText()).toEqual('Built-in Template Functions');
+  });
+
+  it('should display $any( ) in h2', function () {
+    let header = element(by.css('h2'));
+    expect(header.getText()).toContain('$any( )');
+  });
+
+});