Update CHANGELOG.md (#37506)

Author: lzchen

sdk/monitor/azure-monitor-opentelemetry-exporter/CHANGELOG.md

@@ -1,18 +1,12 @@
 # Release History
 
-## 1.0.0b30 (Unreleased)
-
-### Features Added
-
-### Breaking Changes
+## 1.0.0b30 (2024-09-20)
 
 ### Bugs Fixed
 
 - Fix setting custom `TracerProvider` bug
     ([#37469](https://github.com/Azure/azure-sdk-for-python/pull/37469))
 
-### Other Changes
-
 ## 1.0.0b29 (2024-09-10)
 
 ### Features Added