docs: fix generator template tutorial broken link (#1122)

Co-authored-by: Sergio Moya <[email protected]>%0ACo-authored-by: Lukasz Gornicki <[email protected]>

docs/generator-template.md

@@ -572,4 +572,4 @@ Great job completing this tutorial! You have learnt how to use an AsyncAPI file
 
 If you want to tinker with a completed template and see what it would look like in production, check out the [Paho-MQTT template](https://github.com/derberg/python-mqtt-client-template/tree/v1.0.0). You can also check out the accompanying [article about creating MQTT client code](https://www.brainfart.dev/blog/asyncapi-codegen-python).
 
-You can also check out the [MQTT beginners guide]((https://medium.com/python-point/mqtt-basics-with-python-examples-7c758e605d4)) tutorial to learn more about asynchronous messaging using MQTT.
+You can also check out the [MQTT beginners guide](https://medium.com/python-point/mqtt-basics-with-python-examples-7c758e605d4) tutorial to learn more about asynchronous messaging using MQTT.