Update changelog removing unused sections (#25413)

Author: AriZavala2

sdk/communication/Azure.Communication.NetworkTraversal/CHANGELOG.md

@@ -9,12 +9,6 @@
 - Introducing GetRelayConfigurationOptions which contains the optional parameters UserIdentity and RouteType
   when calling the methods GetRelayConfiguration and GetRelayConfigurationAsync. 
 
-### Breaking Changes
-
-### Bugs Fixed
-
-### Other Changes
-
 ## 1.0.0-beta.2 (2021-07-14)
 
 ### Breaking Changes