docs: add LB race condition fix to 1.7.2 release notes

Document TP-10652 fix: serialized external LB teardown before
service recreation (pause, listener removal, type changes).

Author: girish332

k8s/docs/09-release-notes/operator-1.7.2.md

@@ -60,5 +60,6 @@ Refer to the documentation [How to upgrade TigerGraph Kubernetes Operator](../04
 
 ## Bug Fixes
 
+- Fixed a LoadBalancer provisioning race condition by serializing external LB teardown — the operator now waits for the service to be fully removed before recreating it, preventing conflicts during pause, listener removal, and service type changes;
 - Improved pod startup reliability during cluster operations such as restarts and recreations;
 - Improved cluster startup stability;