Merge branch 'docs-net-updates-for-old-and-cobwebbed-docs'

Jakub Kicinski says:

====================
docs: net: updates for old and cobwebbed docs

I'm hoping to start feeding our docs into the AI review tools, instead
of maintaining a separate repo with review prompts. To experiment with
that we have to refresh the docs a little bit.

A read thru our current docs makes one slightly question the value
of including them in reviews. But directionally, I feel, it's probably
still right. I'm hoping the Rx Checksum section about not dropping packets
for example to be impactful. I don't think the current AI agents or
review docs include this guidance.
====================

Link: https://patch.msgid.link/20260526160151.2793354-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>