Update 0450-swiftpm-package-traits.md

Co-authored-by: Ben Rimmington <[email protected]>

Author: MaxDesiatov

proposals/0450-swiftpm-package-traits.md

@@ -5,7 +5,6 @@
 * Review Manager: [Mishal Shah](https://github.com/shahmishal)
 * Status: **Implemented (Swift 6.1)**
 * Implementation: https://github.com/swiftlang/swift-package-manager/pull/7704, https://github.com/swiftlang/swift-package-manager/pull/7703, https://github.com/swiftlang/swift-package-manager/pull/7702, https://github.com/swiftlang/swift-package-manager/pull/7701, https://github.com/swiftlang/swift-package-manager/pull/7694, https://github.com/swiftlang/swift-package-manager/pull/7689, https://github.com/swiftlang/swift-package-manager/pull/8178
-* Experimental Implementation: Gated on `@_spi(ExperimentalTraits)` in package manifests and `--experimental` prefix for CLI options
 * Review: ([pitch](https://forums.swift.org/t/pitch-package-traits/72191)) ([review](https://forums.swift.org/t/se-0450-package-traits/75598)) ([acceptance](https://forums.swift.org/t/accepted-with-modifications-se-0450-package-traits/76705))
 
 ## Introduction