Update comment in types.go, to be included in the new CRD docs
See https://github.com/kubernetes-csi/docs/pull/506\#pullrequestreview-943092112
@@ -341,8 +341,6 @@ type VolumeSnapshotContentSpec struct {
// VolumeSnapshotContentSource represents the CSI source of a snapshot.
// Exactly one of its members must be set.
// Members in VolumeSnapshotContentSource are immutable.
-// TODO(xiangqian): Add a webhook to ensure that VolumeSnapshotContentSource members
-// will be immutable once specified.
type VolumeSnapshotContentSource struct {
// volumeHandle specifies the CSI "volume_id" of the volume from which a snapshot
// should be dynamically taken from.
