Fix a markdown grammatical error

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FirejqWei 2020-02-11 02:03:57 +08:00 committed by GitHub
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@ -91,7 +91,8 @@ $ docker image ls nginx
REPOSITORY TAG IMAGE ID CREATED SIZE
nginx v2 07e334659748 9 seconds ago 181.5 MB
nginx 1.11 05a60462f8ba 12 days ago 181.5 MB
nginx latest e43d811ce2f4 4 weeks ago 181.5 MB```
nginx latest e43d811ce2f4 4 weeks ago 181.5 MB
```
我们还可以用 `docker history` 具体查看镜像内的历史记录如果比较 `nginx:latest` 的历史记录我们会发现新增了我们刚刚提交的这一层