net: Fix documentation for unregister_netdevice_notifier_net

unregister_netdevice_notifier_net() is used for unregister a notifier
registered by register_netdevice_notifier_net(). Also s/into/from/.

Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/dev.c

@@ -1840,7 +1840,7 @@ EXPORT_SYMBOL(register_netdevice_notifier_net);
  * @nb: notifier
  *
  * Unregister a notifier previously registered by
- * register_netdevice_notifier(). The notifier is unlinked into the
+ * register_netdevice_notifier_net(). The notifier is unlinked from the
  * kernel structures and may then be reused. A negative errno code
  * is returned on a failure.
  *