BZ2073610 - Adding note for extra storage when installing single node

Author: kelbrown20

modules/install-sno-generating-the-discovery-iso-with-the-assisted-installer.adoc

@@ -49,3 +49,8 @@ All DNS records must be subdomains of this base domain and include the cluster n
 . Download the discovery ISO.
 
 . Make a note of the discovery ISO URL for installing with virtual media.
+
+[NOTE]
+=====
+If you enable {VirtProductName} during this process, you must have a second local storage device of at least 50GiB for your virtual machines.
+=====