To avoid confusion the SelectedDescription method of topology.Server should take a description.TopologyKind to ensure that users don't get confused or experience strange behavior, e.g. thinking that since the Server is a member of a Topology that the Kind property of the returned description.SelectedServer will be whatever the description.TopologyKind is of the Topology.

Additionally, remove this as a method for a topology.Server and instead make it a function that takes a topology.Server and a description.TopologyKind.