doc/netlink: rt-link: fix binary attributes marked as strings

These link-attrs attributes were previously marked as strings:

- wireless - struct iw_event
- protinfo - a nest of ifla6-attrs or linkinfo-brport-attrs
- cost, priority - unused

Signed-off-by: Remy D. Farley <one-d-wide@protonmail.com>
Link: https://patch.msgid.link/20260529121355.1564817-1-one-d-wide@protonmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Documentation/netlink/specs/rt-link.yaml

@@ -880,19 +880,21 @@ attribute-sets:
         struct: rtnl-link-stats
       -
         name: cost
-        type: string
+        type: unused
       -
         name: priority
-        type: string
+        type: unused
       -
         name: master
         type: u32
       -
         name: wireless
-        type: string
+        type: binary
+        doc: struct iw_event
       -
         name: protinfo
-        type: string
+        type: binary
+        doc: A nest of ifla6-attrs or linkinfo-brport-attrs
       -
         name: txqlen
         type: u32