style(docs-infra): fix docs examples for tslint rules related to whitespace (#38143)

This commit updates the docs examples to be compatible with the `align`,
`space-before-function-paren` and `typedef-whitespace` tslint rules.

This is in preparation of updating the docs examples `tslint.json` to
match the one generated for new Angular CLI apps in a future commit.

PR Close #38143

aio/content/examples/testing/src/app/dashboard/dashboard.component.spec.ts

@@ -109,12 +109,12 @@ function tests(heroClick: Function) {
     let router: Router;
 
      // Trigger component so it gets heroes and binds to them
-     beforeEach(async(() => {
-        router = fixture.debugElement.injector.get(Router);
-        fixture.detectChanges(); // runs ngOnInit -> getHeroes
-        fixture.whenStable() // No need for the `lastPromise` hack!
-          .then(() => fixture.detectChanges()); // bind to heroes
-     }));
+    beforeEach(async(() => {
+      router = fixture.debugElement.injector.get(Router);
+      fixture.detectChanges(); // runs ngOnInit -> getHeroes
+      fixture.whenStable() // No need for the `lastPromise` hack!
+        .then(() => fixture.detectChanges()); // bind to heroes
+    }));
 
     it('should HAVE heroes', () => {
       expect(comp.heroes.length).toBeGreaterThan(0,