There was a pretty valid comment on another thread that search engines will often pipe you to API docs for older compiler releases. This is definitely something that has hit me before. With breaking API changes in the lead up to v1 consistency here, particularly for people new to the language, has a lot of value.
I’m unsure if there’s anything that can be done from an SEO side so that the latest docs are always prioritised. Regardless of what’s possible there, a feature to accompany this that would be incredible for usability is a banner alerting people when they’ve landed on a potentially out of date version along with a link to the latest.
To keep the docs builds static and prevent the needs for changes to the core doc tool inserting this via a CDN may be a neat solution. Unfortunately that side of infrastructure is not open for contributions on github, but if any of the core team happen to be reading this it would be a useful addition.