docs: release notes for v3.2.0-beta and version references cleanup

docs/api.md

@@ -2,7 +2,8 @@
 
 The full, searchable reference is the Integration page of the running app (`/integration`). It
 renders `web/src/data/apiCatalogue.ts`, which is the single source for this page. This file is for
-readers without the UI.
+readers without the UI. Reading articles (pagination, `format`, body schemas) has its own page,
+[api/articles.md](api/articles.md), and API keys are covered in [api/api-keys.md](api/api-keys.md).
 
 ## Base URL
 The origin that serves the app, for example `https://cms.example`. Every path starts with `/v1`,