Begin review of SE-0394

Author: beccadax

proposals/NNNN-swiftpm-expression-macros.md renamed to proposals/0394-swiftpm-expression-macros.md

@@ -1,9 +1,10 @@
 # Package Manager Support for Custom Macros
 
-* Proposal: [SE-NNNN](NNNN-swiftpm-expression-macros.md)
+* Proposal: [SE-0394](0394-swiftpm-expression-macros.md)
 * Authors: [Boris Buegling](https://github.com/neonichu), [Doug Gregor](https://github.com/DougGregor)
-* Review Manager: TBD
-* Status: **Implementation available behind pre-release tools-version https://github.com/apple/swift-package-manager/pull/6185 and https://github.com/apple/swift-package-manager/pull/6200**
+* Review Manager: [Becca Royal-Gordon](https://github.com/beccadax)
+* Status: **Active Review (April 3...April 17, 2023)**
+* Implementation: **Available behind pre-release tools-version** ([apple/swift-package-manager#6185](https://github.com/apple/swift-package-manager/pull/6185), [apple/swift-package-manager#6200](https://github.com/apple/swift-package-manager/pull/6200))
 * Review: ([pitch 1](https://forums.swift.org/t/pitch-package-manager-support-for-custom-macros/63482)) ([pitch 2](https://forums.swift.org/t/pitch-2-package-manager-support-for-custom-macros/63868))
 
 ## Introduction