docs: netdev: recommend against --in-reply-to

It's somewhat unfortunate but with (my?) the current tooling
if people post new versions of a set in reply to an old version
managing the review queue gets difficult. So recommend against it.
Reviewed-by: Martin Habets <habetsm.xilinx@gmail.com>
Link: https://lore.kernel.org/r/20230823154922.1162644-1-kuba@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Documentation/process/maintainer-netdev.rst

@@ -167,6 +167,8 @@ Asking the maintainer for status updates on your
 patch is a good way to ensure your patch is ignored or pushed to the
 bottom of the priority list.
 
+.. _Changes requested:
+
 Changes requested
 ~~~~~~~~~~~~~~~~~
 
@@ -359,6 +361,10 @@ Make sure you address all the feedback in your new posting. Do not post a new
 version of the code if the discussion about the previous version is still
 ongoing, unless directly instructed by a reviewer.
 
+The new version of patches should be posted as a separate thread,
+not as a reply to the previous posting. Change log should include a link
+to the previous posting (see :ref:`Changes requested`).
+
 Testing
 -------