Update src/aks-preview/HISTORY.rst

Co-authored-by: Copilot <[email protected]>

Author: bingosummer

src/aks-preview/HISTORY.rst

@@ -14,7 +14,7 @@ Pending
 
 19.0.0b12
 +++++++
-* `az aks update`: Set CMK property "enabled" to false and reserve other CMK properties for a PMK-enabled and CMK-disabled cluster
+* `az aks update`: Set CMK property "enabled" to false and preserve other CMK configuration properties (key_id, key_vault_resource_id, key_vault_network_access) when CMK is disabled
 
 19.0.0b11
 +++++++