Fix link.

Author: SudoBrendan

articles/openshift/built-in-container-registry.md

@@ -23,7 +23,7 @@ In this article, you'll configure the built-in container image registry for an A
 This article assumes you have an existing ARO cluster (see [Create an Azure Red Hat OpenShift 4 cluster](./tutorial-create-cluster.md)). If you would like to configure Azure AD integeration, make sure to create the cluster with the `--pull-secret` argument to `az aro create`.
 
 > [!NOTE]
-> [Configuring Azure AD Authentication](./configure-azure-ad-ui#configure-openshift-openid-authentication) for your cluster is the easiest way to interact with the internal registry from outside the cluster.
+> [Configuring Azure AD Authentication](./configure-azure-ad-ui.md#configure-openshift-openid-authentication) for your cluster is the easiest way to interact with the internal registry from outside the cluster.
 
 Once you have your cluster, [connect to the cluster](./tutorial-connect-cluster.md) by authenticating as the `kubeadmin` user.