fix typo

Author: Kent C. Dodds

content/blog/2019-02-06-react-v16.8.0.md

@@ -50,7 +50,7 @@ Even while Hooks were in alpha, the React community created many interesting [ex
 
 ## Testing Hooks
 
-We have added a new API called `ReactTestUtils.act()` in this release. It ensures that the behavior in your tests matches what happens in the browser more closely. We recommend to wrap any code rendering and triggering updates to your components into `act()` calls. Testing libraries like can also wrap their APIs with it (for example, [`react-testing-library`](https://github.com/kentcdodds/react-testing-library)'s `render` and `fireEvent` utilities do this).
+We have added a new API called `ReactTestUtils.act()` in this release. It ensures that the behavior in your tests matches what happens in the browser more closely. We recommend to wrap any code rendering and triggering updates to your components into `act()` calls. Testing libraries can also wrap their APIs with it (for example, [`react-testing-library`](https://github.com/kentcdodds/react-testing-library)'s `render` and `fireEvent` utilities do this).
 
 For example, the counter example from [this page](/docs/hooks-effect.html) can be tested like this: