Update security-center-about.mdx

first pass

Author: AmberAlston

docs/vendor/security-center-about.mdx

@@ -16,7 +16,12 @@ The Security Center is powered by Replicated’s [SecureBuild](https://securebui
 * The Security Center is Alpha. The features and functionality of the Security Center are subject to change.
 * Access to the Security Center Alpha requires a feature flag be turned on for your team. For more information, reach out to your Replicated account representative.
 * Security Center reporting is available only for Embedded Cluster and Helm CLI installations. It is not available for kURL installations or for KOTS installations in an existing cluster.
-* Display and reporting of Embedded Cluster images requires the [Replicated SDK version 1.9.0](/release-notes/rn-replicated-sdk#190) or later.
+* Display and reporting of application images requires the [Replicated SDK version 1.8.0](/release-notes/rn-replicated-sdk#180) or later.
+* Display and reporting of Embedded Cluster images requires the [Replicated SDK version 1.9.0](/release-notes/rn-replicated-sdk#190) or later. 
+* In a Helm CLI install, display of all container images observed in the cluster beyond application images requires setting the Replicated SDK to [Report All Images](/vendor/replicated-sdk-customizing#report-all-images). This setting is automatically enabled for Embedded Cluster installations. 
+
+
+Display of all container images observed in the cluster beyond application and Embedded Cluster images requires 
 
 ## Security Center Interfaces
 
@@ -37,6 +42,8 @@ The following shows an example of the vendor-facing Security Center dashboard in
 
 [View a larger version of this image](/images/security-center-dashboard.png)
 
+This dashboard displays an overview of vulnerabilities present in the release for the selected channel and installation type. When a channel is selected, the information displayed is for the promoted release for that channel. 
+
 Additionally, CVE details are available at the individual release level for all current and previously promoted application release versions. To view CVE information for a specifc release go to **Releases > [Release Version] >  Security**.
 
 ### Enterprise Portal