Update CHANGELOG.md

Co-authored-by: Pol Quintana <[email protected]>

Author: nuno-vieira

CHANGELOG.md

@@ -8,7 +8,7 @@ _September 19, 2022_
 
 ## StreamChatUI
 ### 🐞 Fixed
-- Fix the Message List cell not updating when a Reaction of the same type was updated but from the current user [#2304](https://github.com/GetStream/stream-chat-swift/pull/2304)
+- Fix Message List cell not updating when an existing reaction of the same type was updated from the current user [#2304](https://github.com/GetStream/stream-chat-swift/pull/2304)
 - Fix Message List cell not updating when the number of reactions of the same type changed [#2304](https://github.com/GetStream/stream-chat-swift/pull/2304)
 
 # [4.21.1](https://github.com/GetStream/stream-chat-swift/releases/tag/4.21.1)