Update CHANGELOG.md (Azure#23022)

Author: rakshith91

sdk/servicebus/azure-servicebus/CHANGELOG.md

@@ -7,12 +7,6 @@
 - Introduce `ServiceBusMessageState` enum that can assume the values of `active`, `scheduled` or `deferred`.
 - Add `state` property in `ServiceBusReceivedMessage`.
 
-### Breaking Changes
-
-### Bugs Fixed
-
-### Other Changes
-
 ## 7.5.0 (2022-01-12)
 
 This version and all future versions will require Python 3.6+. Python 2.7 is no longer supported.