message: Replace `test` with `it` in TutorialAsync.md
  `it` is used everywhere in TutorialAsync.md except for one test where `test` is used. This commit replaces that `test` with an `it` to keep things consistent and because there does not seem to be a good reason to use `test` over `it` here.
diff: @@ -116,7 +116,7 @@ Errors can be handled using the `.catch` method. Make sure to add `expect.assert
  ```js
  // Testing for async errors using Promise.catch.
  -test('tests error with promises', () => {
  +it('tests error with promises', () => {
  expect.assertions(1);
  return user.getUserName(2).catch(e =>
  expect(e).toEqual({
  