docs(plugin-table-of-contents): add component props

Author: meteorlxy

packages/docs/src/en/plugins/table-of-contents.md

@@ -21,7 +21,13 @@ module.exports = {
 }
 ```
 
-This plugin will register a `<TOC />` component for you, which will render the table-of-contents of current page.
+This plugin will register a `<TOC />` component for you, which will render the table-of-contents of current page. You can use it in your markdown and vue files.
+
+```md
+<!-- README.md / Component.vue -->
+
+<TOC />
+```
 
 ## Configs
 
@@ -32,6 +38,17 @@ This plugin will register a `<TOC />` component for you, which will render the t
 
 Name of the table-of-contents component.
 
+## Component Props
+
+### includeLevel
+
+- **type:** `[number, number]`
+- **default:** `[2, 3]`
+
+The level of title to be included in `<TOC />` component.
+
+For example, `[2, 4]` means 2 <= x <= 4.
+
 ## Demo
 
 ### Input
@@ -44,6 +61,16 @@ Name of the table-of-contents component.
 
 <TOC />
 
+### Input
+
+```md
+<TOC :include-level="[2, 2]" />
+```
+
+### Output
+
+<TOC :include-level="[2, 2]" />
+
 ## Differences from VuePress markdown toc syntax
 
 You may notice that VuePress also provides a [markdown syntax `[[toc]]`](https://vuepress.vuejs.org/guide/markdown.html#table-of-contents) for table-of-contents.

packages/docs/src/zh/plugins/table-of-contents.md

@@ -21,7 +21,13 @@ module.exports = {
 }
 ```
 
-该组件会为你注册一个 `<TOC />` 组件，该组件展示你当前页面文章的目录。
+该组件会为你注册一个 `<TOC />` 组件，该组件展示你当前页面文章的目录，你可以在 Markdown 文件和 Vue 文件中使用它。
+
+```md
+<!-- README.md / Component.vue -->
+
+<TOC />
+```
 
 ## 配置项
 
@@ -32,6 +38,17 @@ module.exports = {
 
 组件的名称。
 
+## 组件 Props
+
+### includeLevel
+
+- **类型:** `[number, number]`
+- **默认值:** `[2, 3]`
+
+`<TOC />` 组件包含的标题范围。
+
+例如，`[2, 4]` 代表 2 <= x <= 4 。
+
 ## 演示
 
 ### 输入
@@ -44,6 +61,16 @@ module.exports = {
 
 <TOC />
 
+### 输入
+
+```md
+<TOC :include-level="[2, 2]" />
+```
+
+### 输出
+
+<TOC :include-level="[2, 2]" />
+
 ## 与 VuePress markdown 目录语法的区别
 
 你可能注意到 VuePress 也提供了一种 [markdown 语法 `[[toc]]`](https://vuepress.vuejs.org/zh/guide/markdown.html#table-of-contents) 来生成目录。