Update client-generator/nextjs.md

Co-Authored-By: Kévin Dunglas <[email protected]>

Author: Gregcop1

client-generator/nextjs.md

@@ -24,7 +24,8 @@ Install typescript dependencies
 $ yarn add @types/next @zeit/next-typescript
 ```
 
-Enable Typescript in your Next.js configuration file ("next.config.js")
+Enable Typescript in your Next.js configuration file (`next.config.js`):
+
 ```javascript
 const withTypescript = require('@zeit/next-typescript');