Update risk score description (#25633)

Co-authored-by: hubwriter <hubwriter@github.com>

content/code-security/security-overview/about-the-security-overview.md

@@ -50,7 +50,7 @@ In the security overview, at both the organization and repository level, there a
 
 ![The security overview for an organization](/assets/images/help/organizations/security-overview.png)
 
-For each repository in the security overview, you will see icons for each type of security feature and how many alerts there are of each type. If a security feature is not enabled for a repository, the icon for that feature will be grayed out.
+For each repository in the security overview, you will see icons for each type of security feature and how many alerts there are of each type. If a security feature is not enabled for a repository, the icon for that feature will be grayed out. In addition, a risk score is calculated for each repository based on its code scanning, Dependabot and secret scanning alerts. This score is in beta and should be used with caution. Its algorithm and approach is subject to change.
 
 ![Icons in the security overview](/assets/images/help/organizations/security-overview-icons.png)
 
@@ -62,6 +62,4 @@ For each repository in the security overview, you will see icons for each type o
 | {% octicon "check" aria-label="Check" %} | The security feature is enabled, but does not raise alerts in this repository. |
 | {% octicon "x" aria-label="x" %} | The security feature is not supported in this repository. |
 
-By default, archived repositories are excluded from the security overview for an organization. You can apply filters to view archived repositories in the security overview. For more information, see "[Filtering alerts in the security overview](/code-security/security-overview/filtering-alerts-in-the-security-overview)."
-
 The security overview displays active alerts raised by security features. If there are no alerts in the security overview for a repository, undetected security vulnerabilities or code errors may still exist.