Docs sec update (kgateway-dev#10486)

Author: Nadine2016

changelog/v1.19.0-beta3/docs-sec-update.yaml

@@ -0,0 +1,5 @@
+changelog:
+  - type: NON_USER_FACING
+    description: >- 
+      Adds security scan 4 file to Enterprise.
+      skipCI-kube-tests:true

docs/content/reference/security-updates/enterprise/_index.md

@@ -9,4 +9,5 @@ Gloo container images are scanned using [Trivy](https://github.com/aquasecurity/
 {{< readfile file="static/content/glooe-security-scan-0.docgen" markdown="true" type="SECURITY_SCAN" >}}
 {{< readfile file="static/content/glooe-security-scan-1.docgen" markdown="true" type="SECURITY_SCAN" >}}
 {{< readfile file="static/content/glooe-security-scan-2.docgen" markdown="true" type="SECURITY_SCAN" >}}
-{{< readfile file="static/content/glooe-security-scan-3.docgen" markdown="true" type="SECURITY_SCAN" >}}
+{{< readfile file="static/content/glooe-security-scan-3.docgen" markdown="true" type="SECURITY_SCAN" >}}
+{{< readfile file="static/content/glooe-security-scan-4.docgen" markdown="true" type="SECURITY_SCAN" >}}