edit intro for update command

Author: paigecalvert

docs/reference/embedded-cluster-update.mdx

@@ -1,11 +1,11 @@
 # update
 
-This topic describes the options available with the Embedded Cluster `update` command. For more information about performing updates with Embedded Cluster, see [Perform Updates in Embedded Clusters](/enterprise/updating-embedded).
+This topic describes the options available with the Embedded Cluster `update` command. The `update` command allows you to update an instance with a new air gap bundle. This is part of the process for performing updates in air-gapped environments. For more information, see [Update in Air Gap Clusters](/enterprise/updating-embedded#update-in-air-gap-clusters) in _Perform Updates in Embedded Clusters_.
 
 ## Usage
 
 ```bash
-sudo ./<app-slug> update [flags]
+sudo ./<app-slug> update. --airgap-bundle <path-to-airgap-bundle> [flags]
 ```
 
 ## Flags