[cinder-csi-plugin] Add comment about deprecation (#2361)

CSI inline ephemeral volumes are deprecated for the *Cinder CSI driver*,
not k8s as a whole. Clarify this, linking back to the original issue.

Signed-off-by: Stephen Finucane <stephenfin@redhat.com>

pkg/csi/cinder/nodeserver.go

@@ -67,6 +67,7 @@ func (ns *nodeServer) NodePublishVolume(ctx context.Context, req *csi.NodePublis
 
 	ephemeralVolume := req.GetVolumeContext()["csi.storage.k8s.io/ephemeral"] == "true"
 	if ephemeralVolume {
+		// See https://github.com/kubernetes/cloud-provider-openstack/issues/1493
 		klog.Warningf("CSI inline ephemeral volumes support is deprecated in 1.24 release.")
 		return nodePublishEphemeral(req, ns)
 	}