net: openvswitch: fix kernel-doc warnings in internal headers

net: openvswitch: fix kernel-doc warnings in internal headers

Some field descriptions were missing, some were not very accurate.
Not touching the uAPI header or .c files for now.

Formatting of those comments isn't great in general, but at least
they are not missing anything now.

Before:
  $ ./scripts/kernel-doc -none -Wall net/openvswitch/*.h 2>&1 | wc -l
  16

After:
  $ ./scripts/kernel-doc -none -Wall net/openvswitch/*.h 2>&1 | wc -l
  0

Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
Acked-by: Eelco Chaudron <echaudro@redhat.com>
Reviewed-by: Aaron Conole <aconole@redhat.com>
Link: https://patch.msgid.link/20250320224431.252489-1-i.maximets@ovn.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>