Add forum thread link

Author: Uncommon

Documentation/Proposals/NNNN-evaluate-condition.md

@@ -4,7 +4,7 @@
 * Authors: [David Catmull](https://github.com/Uncommon)
 * Status: **Awaiting review**
 * Implementation: [swiftlang/swift-testing#909](https://github.com/swiftlang/swift-testing/pull/909)
-* Review: ([pitch](https://forums.swift.org/...))
+* Review: ([pitch](https://forums.swift.org/t/pitch-introduce-conditiontrait-evaluate/77242))
 
 ## Introduction