AWS billingconductor documentation change
Summary
File renamed from 'Billing-compliance.md' to 'compliance-validation.md' and updated content: changed PDF anchor reference and replaced 'CloudTrail logs' with 'Using AWS User Notifications with AWS Billing Conductor'.
Security assessment
The change is primarily a file rename and minor content update. The new content about AWS User Notifications is a feature update for compliance monitoring, but there is no evidence of addressing a security vulnerability or adding security-specific documentation. Compliance is related to security but this change does not explicitly document security features or vulnerabilities.