MAINTAINERS: don't CC docs@ for netlink spec changes

Documentation/netlink/ contains machine-readable protocol
specs in YAML. Those are much like device tree bindings,
no point CCing docs@ for the changes.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Simon Horman <simon.horman@corigine.com>

MAINTAINERS

@@ -6211,6 +6211,7 @@ X:	Documentation/devicetree/
 X:	Documentation/driver-api/media/
 X:	Documentation/firmware-guide/acpi/
 X:	Documentation/i2c/
+X:	Documentation/netlink/
 X:	Documentation/power/
 X:	Documentation/spi/
 X:	Documentation/userspace-api/media/
@@ -14615,6 +14616,7 @@ B:	mailto:netdev@vger.kernel.org
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git
 F:	Documentation/core-api/netlink.rst
+F:	Documentation/netlink/
 F:	Documentation/networking/
 F:	Documentation/process/maintainer-netdev.rst
 F:	Documentation/userspace-api/netlink/