chore: add bullet about the maximun input supported.

app.py

@@ -91,6 +91,7 @@ with gr.Blocks() as demo:
         "<li>Type an address to see matching suggestions.</li>"
         "<li>Selecting one will show its polygon.</li>"
         "<li>Previous searches will also suggest addresses.</li>"
+        "<li>The service supports a maximum input of 15 characters.</li>"
         "</ul>"
     )