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You are currently looking at documentation for Umbraco 8 and older versions.
An automated guess is that docs.umbraco.com/umbraco-cms/tutorials/editors-manual/version-management/rollback-to-a-previous-versions/ could be the link to the new documentation for Umbraco 9 and newer versions.
Rollback to a Previous Version
You have the opportunity to access and re-publish older versions, if necessary.
To rollback to a previous version of the page:
Navigate to the page whose versions you wish to view.
Go to the Info tab.
Click on the Rollback button in the History section.
The Rollback window opens. Select a version of the page you wish to Rollback to.
Click Rollback to proceed with the changes. Your content has now been rolled back to the selected version of the page and is saved as a Draft version.
To publish the draft version, click Save and publish.