[.NET] Azure.Communication.Common release updates (Azure#32212)

Author: ostoliarova-msft

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

@@ -1,14 +1,9 @@
 # Release History
 
-## 1.2.1 (Unreleased)
-
-### Features Added
-
-### Breaking Changes
+## 1.2.1 (2022-11-01)
 
 ### Bugs Fixed
-
-### Other Changes
+- Fixed the logic of `PhoneNumberIdentifier` to always maintain the original phone number string whether it included the leading + sign or not.
 
 ## 1.2.0 (2022-09-01)