Update display_name in ReadMe-en (#753)

* Update README.md (#1)

* Delete UserGuide-en.md (#2)

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README-en.md

@@ -99,6 +99,7 @@ class LogWriter(logdir=None,
 | flush_secs      | int     | The maximum cache time of the data generated before recording in a log file, when this time is reached, the data is immediately written to the log file. |
 | filename_suffix | string  | Add a suffix to the default log file name.                   |
 | write_to_disk   | boolean | Write into disk or not.                                      |
+| display_name  | string | Set the name of different runs when `logdir` is too long or needed to be hidden. If not set, the default name is `logdir`.|
 
 #### Example
 

docs/components/README.md

@@ -393,6 +393,7 @@ Graph组件一键可视化模型的网络结构。用于查看模型属性、节
   ```shell
   visualdl --model ./log/model --port 8080
   ```
+*Graph目前只支持可视化网络结构格式的模型文件（如__model__（注意此处为两个下划线'_'））
 
    
 启动后即可查看网络结构可视化：