made small change to network guide
made small change to network guide

replaced capital T w lower case t
changed However, This to However, this

Change-Id: Ic3e847021d0b765ec9f71cfb30d5ce0c6128b960

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