We've recently made a change "in the background", adding an index to each of our release note documents. For an (ample) example, look at the MySQL 5.7 release notes' index page.

The index should make it a lot easier for users to spot (and track) changes of particular features throughout the versions of a MySQL release series (for example, MySQL 5.7 or 8.0).

Release note indexes are automatically updated as new changelogs are created; this is one of the advantages of our highly automated documentation infrastructure -- keeping indexes updated manually would simply not be possible.

Update (2017-07-03): New screenshot, reflecting more readable / less cluttered links to individual release notes.