Fixed #36587 -- Clarified usage of list.insert() for upload handlers.

Thanks Baptiste Mispelon for the report

Co-authored-by: Natalia <124304+nessita@users.noreply.github.com>

AUTHORS

@@ -209,6 +209,7 @@ answer newbie questions, and generally made Django that much better:
     Carlton Gibson <carlton.gibson@noumenal.es>
     cedric@terramater.net
     Chad Whitman <chad.whitman@icloud.com>
+    Chaitanya Keyal <chaitanyakeyal@gmail.com>
     ChaosKCW
     Charlie Leifer <coleifer@gmail.com>
     charly.wilhelm@gmail.com

docs/topics/http/file-uploads.txt

@@ -289,9 +289,10 @@ this handler to your upload handlers like this::
 
     request.upload_handlers.insert(0, ProgressBarUploadHandler(request))
 
-You'd probably want to use ``list.insert()`` in this case (instead of
+Using ``list.insert()``, as shown above, ensures that the progress bar handler
-``append()``) because a progress bar handler would need to run *before* any
+is placed at the beginning of the list. Since upload handlers are executed in
-other handlers. Remember, the upload handlers are processed in order.
+order, this placement guarantees that the progress bar handler runs before the
+default handlers, allowing it to track progress across the entire upload.
 
 If you want to replace the upload handlers completely, you can assign a new
 list::