Create 3.9.4 release notes

Author: hubot

release-notes/3.9.4.md

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+## Bug Fixes
+
+* On an instance with Actions enabled, incorrect backup and restore settings prevented the storage container name from being restored. This made the logs from that container inaccessible, and caused Actions to create a new storage container in a different location. {% comment %} https://github.com/github/backup-utils-private/pull/652, https://github.com/github/backup-utils-private/pull/459 {% endcomment %}
+
+## Backups and Disaster Recovery
+
+When a NFS mount is detected for snapshots on backup hosts, backup logs will show a warning to notify the user that such a setup may incur performance issues as highlighted in [storage requirements](https://github.com/github/backup-utils-private/blob/master/docs/requirements.md#storage-requirements) documentation.
+