Fix Crashlytics CHANGELOG.md style nit (#10875)

nit: Added a bullet point to the change entry for 10.6.0 to keep the style consistent with previous releases.

Author: andrewheard

Crashlytics/CHANGELOG.md

@@ -1,5 +1,5 @@
 # 10.6.0
-[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.
+- [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).