message: Fix typo in ExpectAPI.md
diff: @@ -62,7 +62,7 @@ test('even and odd numbers', () => {
  });
  ```
  -`expect.extends` also supports async matchers. Async matchers return a Promise so you will need to await the returned value. Let's use an example matcher to illustrate the usage of them. We are going to implement a very similar matcher than `toBeDivisibleBy`, only difference is that the divisible number is going to be pulled from an external source.
  +`expect.extend` also supports async matchers. Async matchers return a Promise so you will need to await the returned value. Let's use an example matcher to illustrate the usage of them. We are going to implement a very similar matcher than `toBeDivisibleBy`, only difference is that the divisible number is going to be pulled from an external source.
  ```js
  expect.extend({
  