docs: update links to libnetwork docs

Signed-off-by: David Karlsson <[email protected]>

Author: dvdksn

docs/extend/plugins_network.md

@@ -61,11 +61,11 @@ plugin protocol
 
 The network driver protocol, in addition to the plugin activation call, is
 documented as part of libnetwork:
-[https://github.com/moby/moby/blob/master/libnetwork/docs/remote.md](https://github.com/moby/moby/blob/master/libnetwork/docs/remote.md).
+[https://github.com/moby/libnetwork/blob/master/docs/remote.md](https://github.com/moby/libnetwork/blob/master/docs/remote.md).
 
 ## Related Information
 
 To interact with the Docker maintainers and other interested users, see the IRC channel `#docker-network`.
 
 - [Docker networks feature overview](https://docs.docker.com/engine/userguide/networking/)
-- The [LibNetwork](https://github.com/docker/libnetwork) project
+- The [LibNetwork](https://github.com/moby/libnetwork) project