update CHANGELOG.md to include #6834

CHANGELOG.md

@@ -21,6 +21,7 @@ BUG FIXES:
 
 * Data Source: `azurerm_automation_account` - using the ID of the Automation Account, rather than the ID of the Automation Account's Registration Info [GH-6848]
 * `azurerm_api_management` - fixing a crash when `policy` is nil [GH-6862]
+* `azurerm_api_management_named_value` - fix the non empty plan when `secret` is true [GH-6834]
 * `azurerm_application_insights` - `retention_in_days` defaults to 90 [GH-6851]
 * `azurerm_kubernetes_cluster` - fixes the `InvalidLoadbalancerProfile` error [GH-6534]
 * `azurerm_data_factory_trigger_schedule` - setting the `type` required for Pipeline References [GH-6871]