Hi James,
It seems like for every update, two messages get posted to the timeline, the 'Document has been updated' as well as the actual change made (example from above: 'Next Review date set as _______'). Logically, if a user sees the 'Next review date set', they will know that the document has been updated.
Ideally, these would be combined into one message, with the goal being a more condensed timeline. Though maybe there are many cases where the system will only post the 'Document has been updated' with out additional info.
Thanks,
Steven