remove extraneous colon

Author: v-steveadams

articles/iot-hub/breadcrumb/toc.yml

@@ -17,4 +17,4 @@
       topicHref: /azure/iot-hub/index
     - name: IoT Hub
       tocHref: /azure/iot-dps/
-      topicHref:: /azure/iot-hub/index
+      topicHref: /azure/iot-hub/index