Values.RevisionTargetSourceDescribes a RevisionTarget.
type nonrec t = {databaseRevision : String_.t option;A unique string that identifies the version to update the cluster to. You can use this value in ModifyClusterDbRevision.
*)description : String_.t option;A string that describes the changes and features that will be applied to the cluster when it is updated to the corresponding ClusterDbRevision.
*)databaseRevisionReleaseDate : TStamp.t option;The date on which the database revision was released.
*)}