Update Auth CHANGELOG.md (#2549)

Author: Chuan Ren

Firebase/Auth/CHANGELOG.md

@@ -2,7 +2,7 @@
 - Deprecate Microsoft and Yahoo OAuth Provider ID (#2517)
 - Fix an issue where an exception was thrown when linking OAuth credentials. (#2521)
 - Fix an issue where a wrong error was thrown when handling error with
-  FEDERATED_USER_ID_ALREADY_LINKED. (#2530, #2542)
+  FEDERATED_USER_ID_ALREADY_LINKED. (#2522)
 
 # v5.4.0
 - Add support of Generic IDP (#2405).