The original one is removed. Point to the new one (#15287)

* The original one is removed. Point to the new one

* remove locale

sdk/appconfiguration/azure-appconfiguration/README.md

@@ -98,7 +98,7 @@ export AZURE_CLIENT_SECRET="random password"
 export AZURE_TENANT_ID="tenant id"
 ```
 
-Assign one of the applicable [App Configuration roles](https://github.com/Azure/AppConfiguration/blob/master/docs/REST/authorization/aad.md) to the service principal.
+Assign one of the applicable [App Configuration roles](https://docs.microsoft.com/azure/azure-app-configuration/rest-api-authorization-azure-ad) to the service principal.
 
 ##### Create a client
 Once the **AZURE_CLIENT_ID**, **AZURE_CLIENT_SECRET** and