fixes the final square

Author: OniriCorpe

bookworm

@@ -666,7 +666,7 @@ function conclusion() {
   │ take time to read the administator documentation and in particular the    │
   │ sections 'Finalizing your setup' and 'Getting to know YunoHost'.          │
   │                                                                           │
-  │ It is available at the following URL: ➡️  https://yunohost.org/admindoc    │
+  │ It is available at the following URL:   https://yunohost.org/admindoc     │
   ╰───────────────────────────────────────────────────────────────────────────╯