Update CHANGELOG for 8.10.0 (#9033)

Author: ncooke3

FirebaseCore/CHANGELOG.md

@@ -1,8 +1,6 @@
-# Firebase 8.10.1
+# Firebase 8.10.0
 - [fixed] Fixed platform availability checks in Swift Package Manager that may prevent code
   completion for Analytics APIs on macOS and tvOS. (#9032)
-
-# Firebase 8.10.0
 - [added] Firebase now includes community supported Combine publishers. More details can be found
   [here](https://github.com/firebase/firebase-ios-sdk/blob/master/FirebaseCombineSwift/README.md). (#7295)