Update 0375-opening-existential-optional.md (#1814)

Author: xwu

proposals/0375-opening-existential-optional.md

@@ -5,7 +5,7 @@
 * Review Manager: [Xiaodi Wu](https://github.com/xwu)
 * Status: **Active Review (October 11...25, 2022)**
 * Implementation: [apple/swift#61321](https://github.com/apple/swift/pull/61321)
-* Review: ([pitch](https://forums.swift.org/t/mini-pitch-for-se-0352-amendment-allow-opening-an-existential-argument-to-an-optional-parameter/60501))
+* Review: ([pitch](https://forums.swift.org/t/mini-pitch-for-se-0352-amendment-allow-opening-an-existential-argument-to-an-optional-parameter/60501)) ([review](https://forums.swift.org/t/se-0375-opening-existential-arguments-to-optional-parameters/60802))
 
 ## Introduction