Add code language hints

storybook/stories/docs/introduction.story.mdx

@@ -13,7 +13,7 @@ On this interactive site you can browse individual components, their controls, o
 The components displayed on this site can be used in your code to build the editor's UI for your custom blocks or other pages.
 Import them from the components root directory like in below example:
 
-```
+```jsx
 import { Button } from '@wordpress/components';
 
 export default function MyButton() {
@@ -29,7 +29,7 @@ To view the documentation for each component use the **Docs** menu item in the t
 
 To use it in your local development environment run the following command in the top level Gutenberg directory:
 
- ```
+ ```bash
  npm run storybook:dev
  ```