While its true you are going to end up pointing to features that may not yet be in a released version you still have to deal with that dynamic if your user is using 9.0 and you point them to the 9.4 (even if you call it latest) documentation.
It should be reasonably simple to add a rewrite directive to whatever webserver we are using so that "latest" acts as an alias that can be updated once per release; though maybe that isn't the best solution depending on traffic volumes...I've never operated a site at the scale our documentation likely sees.
David J.