[Document] Update webui doc (#587)

* Update webui document

* update

docs/WebUI.md

@@ -7,10 +7,10 @@ Click the tab "Overview".
 * See the experiment trial profile and search space message.
 * Support to download the experiment result.
 
-![](./img/over1.png)
+![](./img/webui-img/over1.png)
 * See good performance trials.
 
-![](./img/over2.png)
+![](./img/webui-img/over2.png)
 
 ## View job default metric
 
@@ -38,9 +38,14 @@ Click the tab "Trial Duration" to see the bar graph.
 Click the tab "Trials Detail" to see the status of the all trials. Specifically:
 
 * Trial detail: trial's id, trial's duration, start time, end time, status, accuracy and search space file.
-* If you run a pai experiment, you can also see the hdfsLogPath.
 
-![](./img/table_openrow.png)
+![](./img/webui-img/detail-local.png)
+
+* If you run a pai or kubeflow experiment, you can also see the hdfsLog.
+
+![](./img/webui-img/detail-pai.png)
+
+![](./img/webui-img/trialog.png)
 
 * Kill: you can kill a job that status is running.
 * Support to search for a specific trial.