Update changelog (#52649)

* Update changelog

* Update fromat

Author: rhurey

sdk/ai/Azure.AI.VoiceLive/CHANGELOG.md

@@ -1,12 +1,6 @@
 # Release History
 
-## 1.0.0-beta.1 (Unreleased)
+## 1.0.0-beta.1 (2025-09-16)
 
 ### Features Added
 Initial Addition of VoiceLiveClient and associated classes.
-
-### Breaking Changes
-
-### Bugs Fixed
-
-### Other Changes