Update toc.yml

Author: krkutser

articles/communication-services/toc.yml

@@ -1047,6 +1047,8 @@ items:
       href: concepts/numbers/phone-number-management-for-israel.md
     - name: Phone number management for Italy
       href: concepts/numbers/phone-number-management-for-italy.md
+    - name: Phone number management for Japan
+      href: concepts/numbers/phone-number-management-for-japan.md
     - name: Phone number management for Latvia
       href: concepts/numbers/phone-number-management-for-latvia.md
     - name: Phone number management for Lithuania