Update adding-typescript.md

Author: gaearon

docusaurus/docs/adding-typescript.md

@@ -10,17 +10,21 @@ title: Adding TypeScript
 To start a new Create React App project with [TypeScript](https://www.typescriptlang.org/), you can run:
 
 ```bash
-$ npx create-react-app my-app --typescript
-$ # or
-$ yarn create react-app my-app --typescript
+npx create-react-app my-app --typescript
+
+# or
+
+yarn create react-app my-app --typescript
 ```
 
 To add [TypeScript](https://www.typescriptlang.org/) to a Create React App project, first install it:
 
 ```bash
-$ npm install --save typescript @types/node @types/react @types/react-dom @types/jest
-$ # or
-$ yarn add typescript @types/node @types/react @types/react-dom @types/jest
+npm install --save typescript @types/node @types/react @types/react-dom @types/jest
+
+# or
+
+yarn add typescript @types/node @types/react @types/react-dom @types/jest
 ```
 
 Next, rename any file to be a TypeScript file (e.g. `src/index.js` to `src/index.tsx`) and **restart your development server**!