Move doc domment fix to M76 (#6002)

Author: morganchen12

FirebaseInAppMessaging/CHANGELOG.md

@@ -1,7 +1,9 @@
+# 2020-07 -- v0.22.1
+- [fixed] Fixed an inaccurate doc comment in `InAppMessagingDisplay` (#5972).
+
 # 2020-07 -- v0.22.0
 - [changed] Functionally neutral updated import references for dependencies. (#5902)
 - [changed] Updated In-App Messaging to consume the Protobuf-less AB Testing SDK (#5890).
-- [fixed] Fixed an inaccurate doc comment in `InAppMessagingDisplay` (#5972).
 
 # 2020-06-02 -- v0.20.2
 - [fixed] Fixed log message for in-app messaging test on device flow (#5680).