minor changelog update

Author: danielortega-msft

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

@@ -4,7 +4,7 @@
 ## 1.3.0b1 (Unreleased)
 
 ### Features Added
-- Adds support for the Browse Available Phone Numbers and Reservations APIs
+- Adds support for the Browse Available Phone Numbers and Reservations APIs.
   - This adds an alternate way to search and purchase phone numbers that allows customers to select which phone numbers they want to reserve and purchase.
 - Adds support for automated purchases of phone numbers from countries requiring a Do Not Resell agreement.
   - For more information, refer to: https://learn.microsoft.com/azure/communication-services/concepts/numbers/sub-eligibility-number-capability