刚看了2020云原生白皮书说几个笔误

1.Linux  bridge写错了
![image](https://user-images.githubusercontent.com/18147157/89409152-2bc86700-d754-11ea-8a43-13016d849a0a.png)
2.cgroup的大小写问题
![image](https://user-images.githubusercontent.com/18147157/89409184-3d117380-d754-11ea-868b-d0925c4d459c.png)
3.k8s伸缩是分钟级别的，这个说法不严谨吧
![image](https://user-images.githubusercontent.com/18147157/89409227-4dc1e980-d754-11ea-9c9a-f3347a4faefb.png)
