docs: fix typo in dynamic routing example (#2515)

docs/guide/routing.md

@@ -327,7 +327,6 @@ Instead, you can pass such content to each page using the `content` property on
 
 ```js
 export default {
-  paths() {
   async paths() {
     const posts = await (await fetch('https://my-cms.com/blog-posts')).json()
 
@@ -338,7 +337,6 @@ export default {
       }
     })
   }
-  }
 }
 ```