update EC air gap install steps to show new checkbox

Author: paigecalvert

docs/enterprise/installing-embedded-air-gap.mdx

@@ -58,22 +58,18 @@ To install with Embedded Cluster in an air gap environment:
 
      [View a larger version of this image](/images/customer-install-instructions-dropdown.png)
 
-     The **Embedded Cluster install instructions** dialog is displayed.
+1. Enable the **Install in an air gap environment** checkbox.
 
-     <img alt="Embedded cluster install instruction dialog" src="/images/embedded-cluster-install-dialog.png" width="500px"/>
+    <img alt="Embedded cluster install instruction dialog" src="/images/embedded-cluster-install-dialog-airgap.png" width="500px"/>
 
-     [View a larger version of this image](/images/embedded-cluster-install-dialog.png)
+    [View a larger version of this image](/images/embedded-cluster-install-dialog-airgap.png)
+
+    This appends the `?airgap=true` query parameter to the end of the `replicated.app` endpoint in the curl command in the first step, which ensures that the air gap bundle is included in the tarball that is downloaded from the API.
 
 1. (Optional) In the **Embedded Cluster install instructions** dialog, under **Select a version**, select a specific application version to install. By default, the latest version is selected.
 
 1. SSH onto the machine where you will install.
 
-1. Modify the curl command provided in the first step in the **Embedded Cluster installation instructions** dialog by adding the `?airgap=true` query parameter to the end of the `replicated.app` endpoint:
-
-    ```bash
-    curl -f https://replicated.app/embedded/APP_SLUG/CHANNEL_SLUG?airgap=true -H "Authorization: LICENSE_ID" -o APP_SLUG-CHANNEL_SLUG.tgz
-    ```
-
 1. On a machine with internet access, run the modified curl command to download the air gap installation assets as a `.tgz`.
 
 1. Move the downloaded `.tgz` to the air gapped machine where you will install.