add comment for the fix

Author: Randall-Jiang

packages/core/src/codewhispererChat/controllers/chat/messenger/messenger.ts

@@ -263,6 +263,7 @@ export class Messenger {
                             // TODO: Handle the error
                         }
                     } else if (cwChatEvent.toolUseEvent?.stop === undefined && toolUseInput !== '') {
+                        // This is for the case when writing tool is executed. The toolUseEvent is non stop but in toolUseInput is not empty. In this case we need show user the current spinner UI.
                         this.sendInitalStream(tabID, triggerID, undefined)
                     }