refactor(docs-infra): fix docs examples for tslint rule only-arrow-functions (#38143)

This commit updates the docs examples to be compatible with the
`only-arrow-functions` tslint rule.

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/service-worker-getting-started/e2e/src/app.e2e-spec.ts

@@ -25,7 +25,7 @@ describe('sw-example App', () => {
     expect(listHeader.getText()).toEqual('Here are some links to help you start:');
   });
 
-  it('should show a list of links', function () {
+  it('should show a list of links', () => {
       element.all(by.css('ul > li > h2 > a')).then((items) => {
         expect(items.length).toBe(4);
         expect(items[0].getText()).toBe('Angular Service Worker Intro');