docs: Brackets missing in the nuxt.config.ts. (#556)

Author: Mohamed jinas

docs/content/1.getting-started/1.setup.md

@@ -23,9 +23,9 @@ npm install --save-dev @nuxtjs/tailwindcss
 
 ::code-group
 ```ts [nuxt.config (Nuxt 3)]
-export default defineNuxtConfig{
-  modules: ['@nuxtjs/tailwindcss']
-}
+export default defineNuxtConfig({
+    modules: ['@nuxtjs/tailwindcss']
+})
 ```
 
 ```ts [nuxt.config (Nuxt 2)]