Merge branch 'doc-netlink-expand-nftables-specification'

Remy D. Farley says:

====================
doc/netlink: Expand nftables specification

Getting out some changes I've accumulated while making nftables work
with Rust netlink-bindings. Hopefully, this will be useful upstream.
====================

Link: https://patch.msgid.link/20260303195638.381642-1-one-d-wide@protonmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Documentation/netlink/netlink-raw.yaml

@@ -19,6 +19,12 @@ $defs:
     type: [ string, integer ]
     pattern: ^[0-9A-Za-z_-]+( - 1)?$
     minimum: 0
+  len-or-limit:
+    # literal int, const name, or limit based on fixed-width type
+    # e.g. u8-min, u16-max, etc.
+    type: [ string, integer ]
+    pattern: ^[0-9A-Za-z_-]+$
+    minimum: 0
 
 # Schema for specs
 title: Protocol
@@ -270,7 +276,10 @@ properties:
                     type: string
                   min:
                     description: Min value for an integer attribute.
-                    type: integer
+                    $ref: '#/$defs/len-or-limit'
+                  max:
+                    description: Max value for an integer attribute.
+                    $ref: '#/$defs/len-or-limit'
                   min-len:
                     description: Min length for a binary attribute.
                     $ref: '#/$defs/len-or-define'