docs: specify endpoint_allowed_accounts clearly

Author: vasiliyskysql

docs/resources/skysql_service.md

@@ -52,7 +52,7 @@ resource "skysql_service" "default" {
 - `architecture` (String) The architecture of the service. Valid values are: amd64 or arm64
 - `availability_zone` (String) The availability zone of the service
 - `deletion_protection` (Boolean) Whether to enable deletion protection. Valid values are: true or false. Default is true
-- `endpoint_allowed_accounts` (List of String) The list of cloud accounts (aws account ids or gcp projects) that are allowed to access the service
+- `endpoint_allowed_accounts` (List of String) The list of cloud accounts (aws, azure, or gcp projects) that are allowed to access the service.  Works only with `privateconnect` endpoint mechanism
 - `endpoint_mechanism` (String) The endpoint mechanism to use. Valid values are: privateconnect or nlb
 - `is_active` (Boolean) Whether the service is active
 - `maxscale_nodes` (Number) The number of MaxScale nodes