Before the new Platform version is released, the documentation needs to be updated.
See Phase 3 in the Release guide. This includes:

Phase 3 (on Release day)
Release Jira (TL, EM)
Forward Security Reports (TL, EM)
Release Maven Central
Release Javadocs
Release the Staged Docs
Push Redirects / URL rewrites adjustments
Adjust Google Custom Search Engine (PM)
Release the Getting Started
Release the Enterprise Download Page