Fixed TOC text for link to IoT Hub extension

Author: KennedyDMSFT

articles/iot-edge/TOC.yml

@@ -350,7 +350,7 @@
     href: https://azure.microsoft.com/develop/iot/
   - name: Azure Roadmap
     href: https://azure.microsoft.com/roadmap/?category=iot
-  - name: Azure IoT Tools for Visual Studio Code
+  - name: Azure IoT Hub extension for Visual Studio Code
     href: https://marketplace.visualstudio.com/items?itemName=vsciot-vscode.azure-iot-toolkit
   - name: Azure IoT Explorer tool
     href: https://github.com/Azure/azure-iot-explorer