update changelog

Author: battermann

changelog.d/1-api-changes/WPB-14307

@@ -1,6 +1,7 @@
-New endpoints for domain registration and verification (#4389, ##):
-  - POST /domain-verification/:domain/token
-  - POST /domain-verification/:domain/backend
-  - POST /domain-verification/:domain/team-token
+New endpoints for domain registration and verification (#4389, #4422)
   - POST /domain-verification/:domain/team
+  - POST /domain-verification/:domain/backend
+  - POST /domain-verification/:domain/challenges
+  - POST /domain-verification/:domain/challenges/:challengeId
+  - POST /domain-verification/:domain/authorize-team
   - POST /get-domain-registration