split code blocks in Adding TypeScript page of Create React App documentation for easier copying and pasting

docusaurus/docs/adding-typescript.md

@@ -9,27 +9,27 @@ title: Adding TypeScript
 
 ## Installation
 
-To start a new Create React App project with [TypeScript](https://www.typescriptlang.org/), you can run:
+To start a new Create React App project with [TypeScript](https://www.typescriptlang.org/), you can run
 
 ```sh
 npx create-react-app my-app --template typescript
-
-# or
-
+```
+or
+```sh
 yarn create react-app my-app --template typescript
 ```
 
 > If you've previously installed `create-react-app` globally via `npm install -g create-react-app`, we recommend you uninstall the package using `npm uninstall -g create-react-app` or `yarn global remove create-react-app` to ensure that `npx` always uses the latest version.
 >
 > Global installs of `create-react-app` are no longer supported.
 
-To add [TypeScript](https://www.typescriptlang.org/) to an existing Create React App project, first install it:
+To add [TypeScript](https://www.typescriptlang.org/) to an existing Create React App project, first install it with
 
 ```sh
 npm install --save typescript @types/node @types/react @types/react-dom @types/jest
-
-# or
-
+```
+or
+```sh
 yarn add typescript @types/node @types/react @types/react-dom @types/jest
 ```