Handle manual updates on same day correctly

[KludgeKML]

• Previously manual updates to the same path on the same day were grouped together and only the last was shown, despite all being present in the content item. The grouping code was correct, but in the view only the last item was displayed.

Fixes: https://govuk.zendesk.com/agent/tickets/5624376

Before and after from: https://www.gov.uk/guidance/style-guide/updates

Before

After

⚠️ This repo is Continuously Deployed: make sure you follow the guidance ⚠️

Follow these steps if you are doing a Rails upgrade.