Fixups for SE-0466 (#2908)

* Fixups for SE-0466

* Edit a typo in the header field
* Add a succinct revision history

* Revise status for automated tooling

Author: xwu

proposals/0466-control-default-actor-isolation.md

@@ -3,7 +3,7 @@
 * Proposal: [SE-0466](0466-control-default-actor-isolation.md)
 * Authors: [Holly Borla](https://github.com/hborla), [Doug Gregor](https://github.com/DougGregor)
 * Review Manager: [Steve Canon](https://github.com/stephentyrone)
-* Status: **Implemented (Swift 6.2)**, **Amendmendment review July 8 - 15, 2025**
+* Status: **Active review (July 8...15, 2025)**
 * Vision: [Improving the approachability of data-race safety](/visions/approachable-concurrency.md)
 * Review: ([pitch](https://forums.swift.org/t/pitch-control-default-actor-isolation-inference/77482))([review](https://forums.swift.org/t/se-0466-control-default-actor-isolation-inference/78321))([acceptance](https://forums.swift.org/t/accepted-se-0466-control-default-actor-isolation-inference/78926))([amendment pitch](https://forums.swift.org/t/pitch-amend-se-0466-se-0470-to-improve-isolation-inference/79854))([amendment review](https://forums.swift.org/t/amendment-se-0466-control-default-actor-isolation-inference/80994))
 
@@ -238,6 +238,11 @@ The enum approach introduces a different way of writing main actor isolation tha
 
 The primary argument for using an enum is that it can be extended in the future to support custom global actor types. This proposal deliberately puts supporting custom global actors in the alternatives considered and not future directions, because defaulting a module to a different global actor does not help improve progressive disclosure for concurrency.
 
+## Revision history
+
+* Changes in amendment review:
+  * Disable `@MainActor` inference when type conforms to a `SendableMetatype` protocol
+
 ## Acknowledgments
 
 Thank you to John McCall for providing much of the motivation for this pitch in the approachable data-race safety vision document, and to Michael Gottesman for helping with the implementation.