Remove the WIP warning from the networking guide
Remove the WIP warning from the networking guide

We have published a stable version of the Networking Guide.
The WIP warning is no longer needed.

Change-Id: Id76c1a1e969e5f3f502296589cddb4f0a3327ceb

AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals