doc: update markdown.md.
				
					
				
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		@@ -218,8 +218,8 @@ Markdown 表格生成器:[tableconvert.com](https://tableconvert.com/)
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[logo]: /images/logo.png "Logo Title"
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```
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### 反斜杠转义
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<!--rehype:wrap-class=row-span-2-->
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| 字符 | 转义 | 描述 |
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|------------|--------|-------------|
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@@ -236,6 +236,13 @@ Markdown 表格生成器:[tableconvert.com](https://tableconvert.com/)
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| \.         | \\\.   | dot 点                      |
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| \!         | \\\!   | exclamation mark 感叹号      |
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### 行内 HTML 元素
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<!--rehype:wrap-class=col-span-2-->
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```html
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目前只支持部分段内 HTML 元素效果,包括 <kdb>, <b>, <i>, <em>, <sup>, <sub>, <br>
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```
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另见
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----
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