Sink "actor isolation" section down and expand on it.
Sink "actor isolation" section down and expand on it.

The "actor isolation" section was really about the rules that are
applied to maintain isolation. Sink those down into detailed design,
and call out three main places where they matter:
* Accesses in executable code
* Overrides
* Protocol conformance

Expand on those areas.

abertelrud/swift-evolution,natecook1000/swift-evolution,apple/swift-evolution,abertelrud/swift-evolution,natecook1000/swift-evolution,apple/swift-evolution