KSPM Getting-started requirements update (#2741)

* updating getting started section with the privileges users needs to view posture data

* updating index needed to view data in discover

* Update docs/cloud-native-security/get-started-with-kspm.asciidoc

Co-authored-by: Benjamin Ironside Goldstein <[email protected]>

Author: tinnytintin10

docs/cloud-native-security/get-started-with-kspm.asciidoc

@@ -6,6 +6,11 @@ This page explains how to configure the Kubernetes Security Posture Management (
 [sidebar]
 --
 * The KSPM integration is available to all Elastic Cloud users. For on-prem deployments, it requires an https://www.elastic.co/pricing[Enterprise subscription].
+* To view posture data, ensure you have the `read` privilege for the following {es} indices:
+
+- `logs-cloud_security_posture.findings_latest-*`
+- `logs-cloud_security_posture.scores-*` 
+- `logs-cloud_security_posture.findings`
 --
 
 The instructions differ depending on whether you're installing on EKS or on unmanaged clusters.