Docs: Update demo guide to reflect Dreamview change. (#1609)

docs/demo_guide/README.md

 # Run Offline Demo
 
-Apollo provides a method to run simulation if you do not have the required hardware.
+Apollo provides a method to run simulation if you do not have the required
+hardware.
 
-Set up the docker release environment by following the instructions in the Install docker section of the Build and Release from Sources page.
+Set up the docker release environment by following the instructions in the
+[Install docker](https://github.com/ApolloAuto/apollo/blob/master/docs/howto/how_to_build_and_release.md#docker)
+section of the
+[Build and Release](https://github.com/ApolloAuto/apollo/blob/master/docs/howto/how_to_build_and_release.md)
+page.
 
 Setup steps:
 
@@ -27,18 +32,12 @@ Setup steps:
     rosbag play docs/demo_guide/demo_1.5.np.bag --loop
     ```
 
-    The `--loop` option enables rosbag to keep playing the bag in a loop playback mode.
+    The `--loop` option enables rosbag to keep playing the bag in a loop
+    playback mode.
 
-4. Open Chrome and go to **localhost:8887** to access Apollo HMI, which opens the screen below.
-    ![](images/start_hmi.png)
-
-5. Click 'Dreamview' switch in the right middle panel.
-    ![](images/dreamview_enable.png)
-
-6. Click upper-right "Dreamview" button to open Dreamview.
-    ![](images/dreamview_launch.png)
-
-7. Dreamview is loaded in browser with address **localhost:8888**.
-    ![](images/dv_trajectory.png)The car in Dreamview is happy to move around in the screen!
+4. Open Chrome and go to **localhost:8888** to access Apollo Dreamview, which
+   opens the screen below.
+    ![](images/dv_trajectory.png)
+   The car in Dreamview is happy to move around!
 
 Congratulations!

docs/demo_guide/README_cn.md

@@ -29,16 +29,8 @@ Apollo演示的安装步骤：
 
     选项 `--loop` 用于设置循环回放模式.
 
-4. 打开Chrome浏览器，在地址栏输入**localhost:8887**即可访问Apollo HMI。 HMI主页如下图所示。
-    ![](images/start_hmi.png)
-
-5. 点击中间控制面板的 'Dreamview' 开关.
-    ![](images/dreamview_enable.png)
-
-6. 点击右上角的"Dreamview" 按钮打开Dreamview.
-    ![](images/dreamview_launch.png)
-
-7. Dreamview会以默认网址**localhost:8888**打开.
-    ![](images/dv_trajectory.png)现在你能看到有一辆汽车在模拟器里移动!
+4. 打开Chrome浏览器，在地址栏输入**localhost:8888**即可访问Apollo Dreamview，如下图所示：
+    ![](images/dv_trajectory.png)
+   现在你能看到有一辆汽车在模拟器里移动!
 
 恭喜你完成了Apollo的演示步骤！