docs: fix code sample

README.md

@@ -128,6 +128,7 @@ Each item of the `sitemaps` array can be setup with its own [sitemap options](#s
       }
     ]
   }
+}
 ```
 
 ### Setup a list of sitemaps
@@ -313,8 +314,9 @@ Set the `hostname` value to each sitemap linked to its sitemap index.
 Array of [sitemap configuration](#sitemap-options]) linked to the sitemap index.
 
 ```js
-  // nuxt.config.js
+// nuxt.config.js
 
+{
   sitemap: {
     path: '/sitemapindex.xml',
     hostname: 'https://example.com',
@@ -328,20 +330,21 @@ Array of [sitemap configuration](#sitemap-options]) linked to the sitemap index.
       }
     ]
   }
+}
 ```
 
 ```xml
-  <!-- generated sitemapindex.xml -->
-
-  <?xml version="1.0" encoding="UTF-8"?>
-  <sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
-    <sitemap>
-      <loc>https://example.com/sitemap-foo.xml</loc>
-    </sitemap>
-    <sitemap>
-      <loc>https://example.com/folder/sitemap-bar.xml</loc>
-    </sitemap>
-  </sitemapindex>
+<!-- generated sitemapindex.xml -->
+
+<?xml version="1.0" encoding="UTF-8"?>
+<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
+  <sitemap>
+    <loc>https://example.com/sitemap-foo.xml</loc>
+  </sitemap>
+  <sitemap>
+    <loc>https://example.com/folder/sitemap-bar.xml</loc>
+  </sitemap>
+</sitemapindex>
 ```
 
 See more [examples](#usage) above.