Code review comment for ~info-martin-konrad/epics-base:deprecation-warning-state-record

That doc warning was only added at the Documentathon (last September, so not really "for a while") when we de-wikified the record reference docs, and it was more to scare people away from using the event record type in new databases than to actually flag that it was about to be deleted. I wouldn't have actually removed it until after lots of warning in the release notes. The disadvantage with putting this in 3.15 and the 3.15 release notes is that when they get merged up to 7.0 the release entries about 3.15 changes appear somewhere towards the middle of the release document, not at the top, so it will actually be less visible than if you were to make the change directly on the 7.0 branch.