Add pitch link

Author: grynspan

Diff for: Documentation/Proposals/NNNN-ranged-confirmations.md

@@ -4,7 +4,7 @@
 * Authors: [Jonathan Grynspan](https://github.com/grynspan)
 * Status: **Awaiting review**
 * Implementation: [swiftlang/swift-testing#598](https://github.com/swiftlang/swift-testing/pull/598), [swiftlang/swift-testing#689](https://github.com/swiftlang/swift-testing/pull689)
-* Review: TBD
+* Review: ([pitch](https://forums.swift.org/t/pitch-range-based-confirmations/74589))
 
 ## Introduction