fixed links

Author: fraschbi

README.adoc

@@ -3,7 +3,7 @@
 :hivemq-extension-docs-archetype-link: https://www.hivemq.com/docs/extensions/latest/#maven-archetype-chapter
 :hivemq-blog-tools: http://www.hivemq.com/mqtt-toolbox
 :maven-documentation-profile-link: http://maven.apache.org/guides/introduction/introduction-to-profiles.html
-:hivemq-support: https://community.hivemq.com/
+:hivemq-support: https://community.hivemq.com/c/hivemq-extension-sdk/kafka-customization/14
 :hivemq-testcontainer: https://github.com/hivemq/hivemq-testcontainer
 :hivemq-mqtt-client: https://github.com/hivemq/hivemq-mqtt-client