docs: prettify code

yanglbme · actions-user · commit 9b3e1e2e4620 · 2020-10-21T01:22:18.000Z
diff --git a/docs/big-data/README.md b/docs/big-data/README.md
@@ -36,4 +36,4 @@
 
 关注「**Doocs 开源社区**」公众号，回复 **PDF**，即可获取本项目离线 PDF 文档（283 页精华），学习更加方便！
 
-![](./images/pdf.png)
+![](./images/pdf.png)
diff --git a/docs/distributed-system/README.md b/docs/distributed-system/README.md
@@ -56,4 +56,4 @@
 
 关注「**Doocs 开源社区**」公众号，回复 **PDF**，即可获取本项目离线 PDF 文档（283 页精华），学习更加方便！
 
-![](./images/pdf.png)
+![](./images/pdf.png)
diff --git a/docs/high-availability/README.md b/docs/high-availability/README.md
@@ -55,4 +55,4 @@
 
 关注「**Doocs 开源社区**」公众号，回复 **PDF**，即可获取本项目离线 PDF 文档（283 页精华），学习更加方便！
 
-![](./images/pdf.png)
+![](./images/pdf.png)

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`37`	`37`	`关注「Doocs 开源社区」公众号，回复 PDF，即可获取本项目离线 PDF 文档（283 页精华），学习更加方便！`
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`57`	`57`	`关注「Doocs 开源社区」公众号，回复 PDF，即可获取本项目离线 PDF 文档（283 页精华），学习更加方便！`
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`56`	`56`	`关注「Doocs 开源社区」公众号，回复 PDF，即可获取本项目离线 PDF 文档（283 页精华），学习更加方便！`
`57`	`57`
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	`58`	`+![](./images/pdf.png)`