netlink: specs: ovs_flow: replace underscores with dashes in names

We're trying to add a strict regexp for the name format in the spec.
Underscores will not be allowed, dashes should be used instead.
This makes no difference to C (codegen, if used, replaces special
chars in names) but it gives more uniform naming in Python.

Fixes: 93b230b549 ("netlink: specs: add ynl spec for ovs_flow")
Reviewed-by: Donald Hunter <donald.hunter@gmail.com>
Reviewed-by: Ilya Maximets <i.maximets@ovn.org>
Reviewed-by: Eelco Chaudron <echaudro@redhat.com>
Link: https://patch.msgid.link/20250624211002.3475021-7-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Documentation/netlink/specs/ovs_flow.yaml

@@ -216,7 +216,7 @@ definitions:
     type: struct
     members:
       -
-        name: nd_target
+        name: nd-target
         type: binary
         len: 16
         byte-order: big-endian
@@ -258,12 +258,12 @@ definitions:
     type: struct
     members:
       -
-        name: vlan_tpid
+        name: vlan-tpid
         type: u16
         byte-order: big-endian
         doc: Tag protocol identifier (TPID) to push.
       -
-        name: vlan_tci
+        name: vlan-tci
         type: u16
         byte-order: big-endian
         doc: Tag control identifier (TCI) to push.