Update date for beta release (#45415)

* Update date for beta release

* Remove empty sections

Author: sofiar-msft

sdk/communication/azure-communication-phonenumbers/CHANGELOG.md

@@ -1,6 +1,6 @@
 # Release History
 
-## 1.3.0-beta.1 (Unreleased)
+## 1.3.0-beta.1 (2025-05-21)
 
 ### Features Added
 
@@ -10,12 +10,6 @@
   - For more information, refer to: https://learn.microsoft.com/azure/communication-services/concepts/numbers/sub-eligibility-number-capability
 - API version `2025-04-01` is the default.
 
-### Breaking Changes
-
-### Bugs Fixed
-
-### Other Changes
-
 ## 1.2.2 (2025-03-24)
 
 ### Other Changes