docs: explain the masquerade binding process
docs: explain the masquerade binding process

The explanation builds on the existent explanation of the bridge
binding mechanism, referring to it whenever's appropriate.

The main focus of the explanation is how the traffic is NAT'ed
between the pod networking interface and the in-pod bridge.

Signed-off-by: Miguel Duarte Barroso <c798d3f0e4fda7badfc3bbd91babde7ebd48b6c2@redhat.com>

davidvossel/kubevirt,davidvossel/kubevirt,stu-gott/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,stu-gott/kubevirt,davidvossel/kubevirt,stu-gott/kubevirt,davidvossel/kubevirt,stu-gott/kubevirt,kubevirt/kubevirt