docs: add tls option to server storage example

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

@@ -265,6 +265,7 @@ export default defineNuxtConfig({
         username: "", // needs Redis >= 6
         password: "",
         db: 0 // Defaults to 0
+        tls: {}, // tls/ssl
       }
     }
   }