Merge branch 'doc-netlink-specs-add-vlan-support'

Hangbin Liu says:

====================
doc/netlink/specs: Add vlan support

Add vlan support in rt_link spec.
====================

Link: https://lore.kernel.org/r/20240327123130.1322921-1-liuhangbin@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>