Update using_mysql.md to refer to the MariaDB image

content/anvil/using_mysql.md

@@ -22,7 +22,7 @@ the instructions for [Windows]({{< relref "connecting_to_linux_instances_from_wi
 or [Mac]({{< relref "connecting_to_linux_instances_from_mac" >}}) as needed.
 {{% /notice %}}
 
-This guide assumes you have already created an instance using the `MySQL Server` image.
+This guide assumes you have already created an instance using the `MariaDB Server` image.
 In order to access the database, two additional steps are required.  A
 _Security Group_ must be created in OpenStack to allow access to the MySQL port (3306),
 and the randomly generated password must be recovered.