update doc

site/src/site/sphinx/en/quick-start.md

@@ -154,7 +154,7 @@ ts=2018-09-10 17:53:15;result=@Integer[625]
 
 [more advanced functions](advanced-use.md)
 
-## Exit Arthas
+## 5. Exit Arthas
 
-- `quit` or `exit` will just disconnect the current console connection while Arthas still attached to the target process
-- `shutdown` will terminate the Arthas process completely
+- `quit` or `exit` will just disconnect the current console connection while Arthas still running in the target process
+- `shutdown` will terminate the Arthas completely

site/src/site/sphinx/quick-start.md

@@ -141,7 +141,7 @@ ts=2018-09-10 17:53:15;result=@Integer[625]
 
 更多的功能可以查看[进阶使用](advanced-use.md)。
 
-## 退出arthas
+## 5. 退出arthas
 
 如果只是退出当前的连接，可以用`quit`或者`exit`命令。Attach到目标进程上的arthas还会继续运行，端口会保持开放，下次连接时可以直接连接上。