[CNVM] Adds notes about CNVM architecture support (#5340)

* Adds notes about CNVM architecture support

* Update docs/cloud-native-security/vuln-management-faq.asciidoc

* Update docs/cloud-native-security/vuln-management-get-started.asciidoc

(cherry picked from commit d1cd713)

docs/cloud-native-security/vuln-management-faq.asciidoc

@@ -11,6 +11,10 @@ The CNVM integration uses various security data sources. The complete list can b
 
 CNVM uses the open source scanner https://github.com/aquasecurity/trivy[Trivy] v0.35.
 
+*What system architectures are supported?*
+
+Because of Trivy's limitations, CNVM can only be deployed on ARM-based VMs. However, it can scan hosts regardless of system architecture.
+
 *How often are the security data sources synchronized?*
 
 The CNVM integration fetches the latest data sources at the beginning of every scan cycle to ensure up-to-date vulnerability information.

docs/cloud-native-security/vuln-management-get-started.asciidoc

@@ -8,7 +8,8 @@ This page explains how to set up Cloud Native Vulnerability Management (CNVM).
 --
 * CNVM is available to all {ecloud} users. On-premise deployments require an https://www.elastic.co/pricing[Enterprise subscription].
 * Requires {stack} and {agent} version 8.8 or higher.
-* CNVM only works in the `Default` {kib} space. Installing the CNVM integration on a different {kib} space will not work. 
+* Only works in the `Default` {kib} space. Installing the CNVM integration on a different {kib} space will not work. 
+* CNVM can only be deployed on ARM-based VMs.
 * To view vulnerability scan findings, you need at least `read` privileges for the following indices:
 ** `logs-cloud_security_posture.vulnerabilities-*`
 ** `logs-cloud_security_posture.vulnerabilities_latest-*`