typo error: carpark thingsboard

Author: KasunThushara

articles/Chapter_6-RaspberryPi_and_AIoT/Car_Park_Solution_Management_with_Thingsboard.md

@@ -34,7 +34,7 @@ Detailed instructions on model labeling and training can be found in Chapter 5
 
 [How to training the model](https://seeed-projects.github.io/Tutorial-of-AI-Kit-with-Raspberry-Pi-From-Zero-to-Hero/docs/Chapter_5-Custom_Model_Development_and_Deployment/Training_Your_Model)
 
-[How to convert ONXX model to HEF](https://seeed-projects.github.io/Tutorial-of-AI-Kit-with-Raspberry-Pi-From-Zero-to-Hero/docs/Chapter_5-Custom_Model_Development_and_Deployment/Convert_Your_Model)
+[How to convert ONNX model to HEF](https://seeed-projects.github.io/Tutorial-of-AI-Kit-with-Raspberry-Pi-From-Zero-to-Hero/docs/Chapter_5-Custom_Model_Development_and_Deployment/Convert_Your_Model)
 
 ## Step 3: Deploy the Model