build(docs-infra): update project structure to cli@9 3/12 (title in a h1 tag) (#36015)

Make test description less implementation specific.

PR Close #36015

aio/content/examples/template-reference-variables/src/app/app.component.spec.ts

@@ -18,7 +18,7 @@ describe('AppComponent', () => {
     const app = fixture.componentInstance;
     expect(app.title).toEqual('app');
   }));
-  it('should render title in a h1 tag', async(() => {
+  it('should render title', async(() => {
     const fixture = TestBed.createComponent(AppComponent);
     fixture.detectChanges();
     const compiled = fixture.debugElement.nativeElement;