The forum is a good place to start constrasting examples of Rust lifetime variables vs. Swift lifetime dependence. I also imagine interesting blog posts on this topic in the future. But it's not the job of the official Swift language docs to teach Rust syntax to Swift devs.
The intention is that Swift's syntax will eventually be at least as powerful as Rust. We do want to make sure people can translate between both syntax forms without losing semantics.
I'd like to state up front that the primary goal for Swift is to design clear and obvious APIs for the majority of programmers who do not know what a lifetime variable is, and simply need to call into Swift libraries. I don't think most programmers will ever need to know what a lifetime variable is because it's an artificial abstraction, rather than a fundamental property of the API.