add ec al2 limitation (#3034)

* Update embedded-overview.mdx

* Update embedded-overview.mdx

Author: ajp-io

docs/vendor/embedded-overview.mdx

@@ -118,4 +118,6 @@ Embedded Cluster has the following limitations:
 
 * **Policy enforcement on Embedded Cluster workloads is not supported**: The Embedded Cluster runs workloads that require higher levels of privilege. If your application installs a policy enforcement engine such as Gatekeeper or Kyverno, ensure that its policies are not enforced in the namespaces used by Embedded Cluster.
 
-* **Installing on STIG- and CIS-hardened OS images is not supported**: Embedded Cluster isn't tested on these images, and issues have arisen when trying to install on them.
+* **Installing on STIG- and CIS-hardened OS images is not supported**: Embedded Cluster isn't tested on these images, and issues have arisen when trying to install on them.
+
+* **Installing on Amazon Linux 2 is not supported**: Amazon Linux 2 includes a very dated version of systemd that isn't compatible with Embedded Cluster.