Merge pull request facebook#12242 from yamankatby/patch-1

Update adding-a-router.md

Author: matrush

docusaurus/docs/adding-a-router.md

@@ -3,12 +3,12 @@ id: adding-a-router
 title: Adding a Router
 ---
 
-Create React App doesn't prescribe a specific routing solution, but [React Router](https://reacttraining.com/react-router/web/) is the most popular one.
+Create React App doesn't prescribe a specific routing solution, but [React Router](https://reactrouter.com/) is the most popular one.
 
 To add it, run:
 
 ```sh
-npm install --save react-router-dom
+npm install react-router-dom
 ```
 
 Alternatively you may use `yarn`:
@@ -17,6 +17,6 @@ Alternatively you may use `yarn`:
 yarn add react-router-dom
 ```
 
-To try it, delete all the code in `src/App.js` and replace it with any of the examples on its website. The [Basic Example](https://reacttraining.com/react-router/web/example/basic) is a good place to get started.
+To try it, delete all the code in `src/App.js` and replace it with any of the examples on its website. The [Basic Example](https://reactrouter.com/docs/examples/basic) is a good place to get started.
 
 Note that [you may need to configure your production server to support client-side routing](deployment.md#serving-apps-with-client-side-routing) before deploying your app.