Fix cognito

Author: lgrateau

authentication/Cognito/README.md

@@ -530,7 +530,7 @@ In the **Container software library** tile, verify your entitlement on the **Vie
 #### b. Installation using Ingress
 
   Refer to the following documentation to install an NGINX Ingress Controller on:
-  - [Microsoft Azure Kubernetes Service](../../platform/azure/README.md#create-a-nginx-ingress-controller)
+  - [Microsoft Azure Kubernetes Service](../../platform/azure/README-NGINX.md)
   - [Amazon Elastic Kubernetes Service](../../platform/eks/README-NGINX.md)
   - [Google Kubernetes Engine](../../platform/gcloud/README_NGINX.md)