updates to Changelog (Azure#22953)

Author: kashifkhan

sdk/search/azure-search-documents/CHANGELOG.md

@@ -1,15 +1,11 @@
 # Release History
 
-## 11.3.0b7 (Unreleased)
+## 11.3.0b7 (2022-02-08)
 
 ### Features Added
 
 - Added models: `AzureMachineLearningSkill`
 
-### Breaking Changes
-
-### Bugs Fixed
-
 ### Other Changes
 
 - Python 2.7 is no longer supported. Please use Python version 3.6 or later.