docs: fix aad url

Signed-off-by: Anish Ramasekar <anish.ramasekar@gmail.com>

README.md

@@ -35,7 +35,7 @@ Azure AD Workload Identity is an open source project that is [**not** covered by
 <!-- - Ensure backward compatibility when upgrading from [AAD Pod Identity](https://github.com/Azure/aad-pod-identity). -->
 
 [1]: https://github.com/Azure/aad-pod-identity
-[2]: https://azure.microsoft.com/en-us/services/active-directory/
+[2]: https://azure.microsoft.com/en-us/products/active-directory/
 [3]: https://kubernetes.io/docs/tasks/configure-pod-container/configure-service-account/
 [4]: https://azure.github.io/azure-workload-identity/docs/quick-start.html
 [5]: https://azure.github.io/azure-workload-identity/docs/installation/mutating-admission-webhook.html