In T481#6206, @Qgil points out several pages that we should consider merging.
- https://www.mediawiki.org/wiki/Version_lifecycle
- https://www.mediawiki.org/wiki/Branch_points
- https://www.mediawiki.org/wiki/Release_notes
- https://www.mediawiki.org/wiki/WikiReleaseTeam/Release_timeline
- https://www.mediawiki.org/wiki/WikiReleaseTeam/Release_log
I think https://www.mediawiki.org/wiki/WikiReleaseTeam/Release_timeline should at least be pointed to by https://www.mediawiki.org/wiki/Version_lifecycle, but it may make sense to merge them.