SE-0495 switch to proper form for "implemented"

Author: DougGregor

proposals/0495-cdecl.md

@@ -3,8 +3,7 @@
 * Proposal: [SE-0495](0495-cdecl.md)
 * Author: [Alexis Laferrière](https://github.com/xymus)
 * Review Manager: [Steve Canon](https://github.com/stephentyrone)
-* Status: **Active Review (September 25th...October 9th, 2025)**
-* Implementation: On `6.3`. With the exception of the `@objc` support for global functions which is not yet implemented.
+* Status: **Implemented (Swift 6.3)**
 * Review: ([pitch](https://forums.swift.org/t/pitch-formalize-cdecl/79557))([review](https://forums.swift.org/t/se-0495-c-compatible-functions-and-enums/82365))
 
 ## Introduction