Reference
The cross-cutting facts — security posture, the glossary, brand, status, and the changelog.
Reference holds the things that do not belong to a single audience: the security posture in plain language, the glossary of terms used across the platform, brand guidance for partners, the status and uptime promise, and the changelog.
If you are looking for how a feature works, start from your audience section. Reference is for the facts that sit underneath all of them.