Fix CHANGELOG.md (#4528)

CHANGELOG.md

@@ -2,9 +2,6 @@
 
 ## Unreleased
 
-### Fixes
-
-- Make `Scope.span` fully thread safe (#4519)
 ### Features
 
 - Transactions for crashes (#4504): Finish the transaction bound to the scope when the app crashes. This __experimental__ feature is disabled by default. You can enable it via the option `enablePersistingTracesWhenCrashing`.
@@ -14,6 +11,7 @@
 - Keep PropagationContext when cloning scope (#4518)
 - UIViewController with Xcode 16 in debug (#4523). The Xcode 16 build setting [ENABLE_DEBUG_DYLIB](https://developer.apple.com/documentation/xcode/build-settings-reference#Enable-Debug-Dylib-Support), which is turned on by default only in debug, could lead to missing UIViewController traces.
 - Concurrency crash with Swift 6 (#4512)
+- Make `Scope.span` fully thread safe (#4519)
 
 ## 8.40.1