docs: fix syntax errors in server storage example (#8906)

docs/content/2.guide/2.directory-structure/1.server.md

@@ -264,8 +264,8 @@ export default defineNuxtConfig({
         host: "127.0.0.1", // Redis host
         username: "", // needs Redis >= 6
         password: "",
-        db: 0 // Defaults to 0
-        tls: {}, // tls/ssl
+        db: 0, // Defaults to 0
+        tls: {} // tls/ssl
       }
     }
   }