Fix datalake changelog (Azure#25886)

* Updated all changelogs for release

* Undid some script mangling for blob changelog

* fix datalake changelog

Author: rickle-msft

sdk/storage/azure-storage-file-datalake/CHANGELOG.md

@@ -6,8 +6,6 @@
 - Added support for 2021-02-12 service version.
 - Added support for listing system containers.
 
-### Breaking Changes
-
 ### Bugs Fixed
 - Fixed a bug in DataLakeFileClient.flush() in which the logic of the overwrite parameter was reversed.
 - Fixed a bug that would cause authenticating with a sas token to fail if the timestamps in the token were formatted differently.