ChildWorkflowOptions: clarify taskQueue behavior (#1551)

Author: ikonst

packages/workflow/src/interfaces.ts

@@ -346,6 +346,8 @@ export interface ChildWorkflowOptions extends CommonWorkflowOptions {
   /**
    * Task queue to use for Workflow tasks. It should match a task queue specified when creating a
    * `Worker` that hosts the Workflow code.
+   *
+   * By default, a child is scheduled on the same Task Queue as the parent.
    */
   taskQueue?: string;