Merge branch 'docs-netdev-a-couple-of-updates'

Paolo Abeni says:

====================
docs: netdev: a couple of updates

Explicitly covers a couple of relevant spots currently left out in the
dark. Likely the first one was too obvious to ever spell out loud and
the latter too new.

Both cases are increasingly relevant, at least to me.

Keep the update in the netdev subsystem, as others may have slightly
different preferences.
====================

Link: https://patch.msgid.link/cover.1784884817.git.pabeni@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>