missed tag in img
@@ -24,7 +24,7 @@ The [`spark-collectd`](https://github.com/signalfx/collectd-spark) plugin collec
- **Spark Overview**: Overview of Spark cluster.
- [<img src='./img/dashboard_spark_cluster_top.png'](./img/dashboard_spark_cluster_top.png)
+ [<img src='./img/dashboard_spark_cluster_top.png'>](./img/dashboard_spark_cluster_top.png)
[<img src='./img/dashboard_spark_cluster_middle.png'>](./img/dashboard_spark_cluster_middle.png)
