Update design/nodes-machines-and-hosts.md

Co-authored-by: Lennart Jern <[email protected]>

design/nodes-machines-and-hosts.md

@@ -57,7 +57,7 @@ such as draining the node for maintenance. The definition of Node is
 owned by the Kubernetes core, and offers few opportunities to attach
 custom data.
 
-[Machine](https://cluster-api.sigs.k8s.io/developer/architecture/controllers/machine)
+[Machine](https://cluster-api.sigs.k8s.io/user/concepts#machine)
 objects represent a *request* for an instance of kubelet. A parallel
 design is the persistent volume claim and persistent volume in the
 storage APIs. The Machine CRD is owned by the cluster-api SIG. Machine