**Description** When we are using `multiple_state` marking store, we should be able to have multiple `initial_place` as well. **Example** Before ```yaml framework: workflows: order: supports: - 'Foo\Bar\Order' audit_trail: enabled: true type: workflow marking_store: type: 'multiple_state' arguments: - 'marking' places: initial_place: 'order_created' ``` After ```yaml framework: workflows: order: supports: - 'Foo\Bar\Order' audit_trail: enabled: true type: workflow marking_store: type: 'multiple_state' arguments: - 'marking' places: initial_place: - 'order_created' - 'order_cart' ``` Since `multiple_state` allow us to handle more than one marking, it should be same for `initial_place`.