Fix workflow step execution sample code to not await the workflowSteps Slack API responses

docs/_steps/executing_workflow_steps.md

@@ -27,11 +27,18 @@ const ws = new WorkflowStep('add_task', {
       taskDescription: inputs.taskDescription.value,
     };
 
-    // if everything was successful
+    // signal back to Slack that everything was successful
     await complete({ outputs });
-
-    // if something went wrong
-    // fail({ error: { message: "Just testing step failure!" } });
+    // NOTE: If you run your app with processBeforeResponse: true option,
+    // `await complete()` is not recommended because of the slow response of the API endpoint
+    // which could result in not responding to the Slack Events API within the required 3 seconds
+    // instead, use:
+    // complete({ outputs }).then(() => { console.log('workflow step execution complete registered'); });
+
+    // let Slack know if something went wrong
+    // await fail({ error: { message: "Just testing step failure!" } });
+    // NOTE: If you run your app with processBeforeResponse: true, use this instead:
+    // fail({ error: { message: "Just testing step failure!" } }).then(() => { console.log('workflow step execution failure registered'); });
   },
 });
-```
+```

docs/_steps/ja_executing_workflow_steps.md

@@ -28,10 +28,14 @@ const ws = new WorkflowStep('add_task', {
     };
 
     // もし全て OK なら
-    await complete({ outputs });
+    // ここでは await complete() はおすすめしません。呼び出す API の応答が遅いためです。
+    // これにより、3 秒以内に Slack のイベント API に応答することができなくなる場合があります。
+    // 代わりに以下のようにすることができます:
+    // complete({ outputs }).then(() => { console.log('workflow step execution complete registered'); });
+    complete({ outputs }).then(() => { console.log('workflow step execution complete registered'); });
 
     // もし何か問題が起きたら
-    // fail({ error: { message: "Just testing step failure!" } });
+    // fail({ error: { message: "Just testing step failure!" } }).then(() => { console.log('workflow step execution failure registered'); });
   },
 });
-```
+```