Update CHANGELOG.md (#10859)

Crashlytics/CHANGELOG.md

@@ -1,5 +1,5 @@
 # 10.6.0
-- [added] Added dependency on Firebase Sessions SDK to power future metrics and debugging features in Crashlytics
+[added] Integrated with Firebase sessions library to enable upcoming features related to session-based crash metrics. If your app uses the Crashlytics SDK, review Firebase's [data disclosure page](https://firebase.google.com/docs/ios/app-store-data-collection) to make sure that your app's privacy details in the App Store are accurate and complete.
 
 # 10.4.0
 - [added] Updated Crashlytics to include the Firebase Installation ID for consistency with other products (#10645).

FirebasePerformance/CHANGELOG.md

@@ -1,6 +1,6 @@
 # 10.6.0
-- [added] Added dependency on Firebase Sessions SDK to power future metrics and debugging features in Performance Monitoring.
-- [changed] Changed definition of sessions, as Performance Monitoring now depends on the new Firebase Sessions SDK.
+- [added] Integrated with Firebase sessions library and replaced the session information associated with performance metrics with session details provided by the Firebase sessions library. If your app uses the Performance Monitoring SDK, review Firebase's [data disclosure page](https://firebase.google.com/docs/ios/app-store-data-collection) to make sure that your app's privacy details in the App Store are accurate and complete.
+- [changed] Changed definition of sessions, as Performance Monitoring now depends on the new Firebase sessions SDK.
 
 # 9.3.0
 - [changed] Update the console logging URL to troubleshooting page.