chore: remove double warning about experimental auth

Author: innocenzi

src/Web/Documentation/content/main/2-tempest-in-depth/03-auth.md

@@ -4,15 +4,11 @@ keywords: "Experimental"
 ---
 
 :::warning
-The authentication implementation is currently experimental and is not covered by our backwards compatibility promise.
+The authentication and authorization implementations of Tempest are currently experimental. Although you can use them, please note that they are not covered by our backwards compatibility promise.
 :::
 
 ## Overview
 
-:::warning
-The authentication and authorization implementations of Tempest are currently experimental. Although you can use them, please note that they are not covered by our backwards compatibility promise.
-:::
-
 Logging in (authentication )and verifying whether a user is allowed to perform a specific action (authorization) are two crucial parts of any web application. Tempest comes with a built-in authenticator and authorizer, as well as a base `User` and `Permission` model (if you want to).
 
 ## Authentication