Update changelog for #19477

CHANGELOG.md

@@ -18,6 +18,7 @@ BUG FIXES:
 * `azurerm_app_configuration_key` - prevent crash when retrieving the key value [GH-19464]
 * `azurerm_data_factory_linked_service_azure_file_storage` - send `host` and and `user_id` in the payload only when it's been set [GH-19468]
 * `azurerm_stream_analytics_output_eventhub` - `shared_access_policy_key` and `shared_access_policy_name` are now optional  [GH-19447]
+* `azurerm_synapse_linked_service` - a state migration to work around the previously incorrect id casing  [GH-19477]
 * `azurerm_windows_web_app` - Fix currentStack is being reset when other `site_config` values are changed. [GH-18568]
 * `azurerm_windows_web_app_slot` - Fix currentStack is being reset when other `site_config` values are changed. [GH-18568]