Fix minor grammar error (#4756)

Author: peterhauke

content/docs/hooks-intro.md

@@ -32,7 +32,7 @@ This new function `useState` is the first "Hook" we'll learn about, but this exa
 >Note
 >
 >React 16.8.0 is the first release to support Hooks. When upgrading, don't forget to update all packages, including React DOM.
->React Native supports Hooks since [the 0.59 release of React Native](https://reactnative.dev/blog/2019/03/12/releasing-react-native-059).
+>React Native has supported Hooks since [the 0.59 release of React Native](https://reactnative.dev/blog/2019/03/12/releasing-react-native-059).
 
 ## Video Introduction {#video-introduction}
 
@@ -96,7 +96,7 @@ To solve these problems, **Hooks let you use more of React's features without cl
 
 We know that React developers are focused on shipping products and don't have time to look into every new API that's being released. Hooks are very new, and it might be better to wait for more examples and tutorials before considering learning or adopting them.
 
-We also understand that the bar for adding a new primitive to React is extremely high. For curious readers, we have prepared a [detailed RFC](https://github.com/reactjs/rfcs/pull/68) that dives into motivation with more details, and provides extra perspective on the specific design decisions and related prior art.
+We also understand that the bar for adding a new primitive to React is extremely high. For curious readers, we have prepared a [detailed RFC](https://github.com/reactjs/rfcs/pull/68) that dives into the motivation with more details, and provides extra perspective on the specific design decisions and related prior art.
 
 **Crucially, Hooks work side-by-side with existing code so you can adopt them gradually.** There is no rush to migrate to Hooks. We recommend avoiding any "big rewrites", especially for existing, complex class components. It takes a bit of a mind shift to start "thinking in Hooks". In our experience, it's best to practice using Hooks in new and non-critical components first, and ensure that everybody on your team feels comfortable with them. After you give Hooks a try, please feel free to [send us feedback](https://github.com/facebook/react/issues/new), positive or negative.