net: bridge: Describe @tunnel_hash member in net_bridge_vlan_group struct

net: bridge: Describe @tunnel_hash member in net_bridge_vlan_group struct

[ Upstream commit f79f9b7ace1713e4b83888c385f5f55519dfb687 ]

Sphinx reports kernel-doc warning:

WARNING: ./net/bridge/br_private.h:267 struct member 'tunnel_hash' not described in 'net_bridge_vlan_group'

Fix it by describing @tunnel_hash member.

Fixes: efa5356b0d9753 ("bridge: per vlan dst_metadata netlink support")
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/20251218042936.24175-2-bagasdotme@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>