Update custom-event-to-eventhub.md

I'll change Next steps to Related content in this file so that it's consistent among the three articles.

Author: ktoliver

articles/event-grid/custom-event-to-eventhub.md

@@ -125,7 +125,7 @@ If you plan to continue working with this event, don't clean up the resources th
 az group delete --name gridResourceGroup
 ```
 
-## Next steps
+## Related content
 
 Now that you know how to create topics and event subscriptions, learn more about what Event Grid can help you do: