fix(docs): rename buildModules to modules (#263)

buildModules was deprecated in Nuxt 3

Author: Intevel

docs/content/2.setup.md

@@ -18,11 +18,11 @@ Add `@nuxtjs/strapi` dev dependency to your project:
   ```
 ::
 
-Then, add `@nuxtjs/strapi` to the [`buildModules`](https://v3.nuxtjs.org/docs/directory-structure/nuxt.config#buildmodules) section of your Nuxt configuration:
+Then, add `@nuxtjs/strapi` to the [`modules`](https://v3.nuxtjs.org/api/configuration/nuxt.config#modules) section of your Nuxt configuration:
 
 ```ts [nuxt.config.js|ts]
 export default {
-  buildModules: ['@nuxtjs/strapi'],
+  modules: ['@nuxtjs/strapi'],
   strapi: {
     // Options
   }