Fix topic name in Azure CLI command for duplicate detection

Author: EldertGrootenboer

articles/service-bus-messaging/enable-duplicate-detection.md

@@ -77,7 +77,7 @@ Similarly, to **update a topic with a new detection window size**, use the [`az
 az servicebus topic update \
     --resource-group myresourcegroup \
     --namespace-name mynamespace \
-    --name myqueue \
+    --name mytopic \
     --duplicate-detection-history-time-window P7D
 ```