update link to etcd faq to etcd 3.5

Author: reylejano

content/en/docs/setup/production-environment/_index.md

@@ -117,7 +117,7 @@ consider these steps:
   extra security and availability. Because etcd stores cluster configuration data,
   backing up the etcd database should be done regularly to ensure that you can
   repair that database if needed.
-  See the [etcd FAQ](https://etcd.io/docs/v3.4/faq/) for details on configuring and using etcd.
+  See the [etcd FAQ](https://etcd.io/docs/v3.5/faq/) for details on configuring and using etcd.
   See [Operating etcd clusters for Kubernetes](/docs/tasks/administer-cluster/configure-upgrade-etcd/)
   and [Set up a High Availability etcd cluster with kubeadm](/docs/setup/production-environment/tools/kubeadm/setup-ha-etcd-with-kubeadm/)
   for details.