This blog may help you to understand the usage of the relevant documents web part from the SharePoint.
As a SharePoint user, we add, edit and delete the documents, items and sometimes modify SharePoint pages, so after editing something in SharePoint, like documents or pages, we may forget to check in the pages or documents and the recent changes will not be visible to others.
So, just like a reminder or notification, we can use the relevant document web part to identify your changes in the SharePoint site.
To add this Web part in your SharePoint page, edit the page and click insert and search for Content Rollup folder and select the Relevant Document Webpart from the right panel.
Once you've added that web part and clicked edit webpart , then go to the data tab and select your required condition, in my scenario, I just selected “Include documents checked out to me”.
After saving my webpart and page, I get a view like the below image so whatever I check out on the SharePoint page, it will be displayed here.
This webpart works based on users. So, the users can get the update based on their logins.