Example: Minimal updates in change history

[jpmckinney]

#1302 rewrites the Getting Started section as a Primer, which included removing the "Repeating previous information" section from the previous version of the Releases and Records page, accessible here: https://github.com/open-contracting/standard/blob/106f4c4/docs/getting_started/releases_and_records.md#repeating-previous-information

This content should be re-introduced as a worked example.