message: fixed bug in example code expect.stringMatching
diff: @@ -217,8 +217,11 @@ test('randomCoolNames only returns cool names', () => {
  // A reasonable proxy for whether a name is cool or not
  let coolRegex = /^Kevin/;
  - expect(randomCoolNames).toEqual(
  - expect.arrayContaining(expect.stringMatching(coolRegex)));
  + expect(randomCoolNames()).toEqual(
  + expect.arrayContaining([
  + expect.stringMatching(coolRegex)
  + ])
  + );
  });
  ```
  