Typo correction : thingsboard and car park

Author: KasunThushara

articles/Chapter_6-RaspberryPi_and_AIoT/Car_Park_Solution_Management_with_Thingsboard.md

@@ -138,7 +138,7 @@ if __name__ == "__main__":
 
 ```
 
-### Step 4: Install ThingsBoard and Add a Device
+## Step 4: Install ThingsBoard and Add a Device
 
 [ThingsBoard](https://thingsboard.io/) is an open-source IoT platform designed for device management, data collection, processing, and visualization. It supports various communication protocols such as **MQTT, CoAP, and HTTP**, making it versatile for integrating IoT devices and systems. The platform enables users to **create interactive dashboards, monitor devices in real-time, and analyze data through advanced visualization tools. With its rule engine, ThingsBoard automates workflows and event processing**, simplifying the implementation of IoT use cases across industries. Its scalability and flexibility make it suitable for projects of any size, from small prototypes to large-scale deployments.