Hi, thanks for opening this PR! -- Inthe top-level documentation we explain in more detail how the task model works. However it seems we don't link to it from this function which we probably should.

I'm not sure if this example is the best way to convey howtask::spawn works. Instead it may be more effective to adapt thestd::thread::spawn documentation to coverasync_std::task::spawn:

The join handle will implicitlydetach the child task upon being dropped. In this case, the child task may outlive the parent [...]