Add embed-linked video for Databricks Volumes setup (#276)

Author: Paul-Cornell

snippets/general-shared-text/databricks-volumes.mdx

@@ -1,5 +1,15 @@
 The Databricks Volumes prerequisites:
 
+<iframe
+width="560"
+height="315"
+src="https://www.youtube.com/embed/rNZpwa1-g7M"
+title="YouTube video player"
+frameborder="0"
+allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"
+allowfullscreen
+></iframe>
+
 - The Databricks workspace URL. Get the workspace URL for 
   [AWS](https://docs.databricks.com/workspace/workspace-details.html#workspace-instance-names-urls-and-ids), 
   [Azure](https://learn.microsoft.com/azure/databricks/workspace/workspace-details#workspace-instance-names-urls-and-ids),