Merge pull request #3464 from replicatedhq/AmberAlston-patch-1

Make it clearer that headless is for install and not upgrade

Author: AmberAlston

docs/enterprise/installing-embedded-automation.mdx

@@ -19,6 +19,10 @@ The KOTS ConfigValues file includes the fields that are defined in the KOTS Conf
 
 <ConfigValuesExample/>
 
+## Limtiation
+
+Automating deployment with Embedded Cluster is supported only for the initial installation. Performing automated (headless) updates of existing installations with Embedded Cluster is not supported. For information about how to update an existing installation through the Admin Console UI, see [Perform Updates in Embedded Clusters](/enterprise/updating-embedded).
+
 ## Online (Internet-Connected) Installation
 
 To install with Embedded Cluster in an online environment: