It looks like you've found an issue with the versioning logic in our docs. That specific page path didn't exist until the last release, so switching to another version will always result in a 404. True of any additive page going forward, unfortunately.
I'll make a note of this and discuss with the rest of the docs team - it's definitely not an ideal experience. For now, my suggestion for situations like this one is to switch to the version you want and then use the sidenav to navigate.