Give better description to test VM

membervm_nogui.yaml

 # Copy this block and alter as needed, ensuring the top-level key is not indented.
 "test-otf":
-  desc: "Test VM"
+  desc: |
+    This is a test VM, created via member-vm-automation, serving as an example of what is possible.
+
+     * Do not start this VM as it will undoubtedly be very out of date.
+     * Do not delete manually as it will be re-created on the next TF run.
+
+    This VM can be removed from the YAML file once sufficient real examples exist to illustrate.
+
+    For more information see https://gitlab.ucc.asn.au/ucc-configuration/member-vm-automation
+    or contact [MPT] via Discord or <jimbo@ucc.asn.au>.
   node: medico
   sockets: 1
   cores: 2