docs: complete missing prop of checkbox (#4865)

bobo leng · web-flow · commit 723785ef4ea7 · 2021-11-20T13:27:29.000+08:00
* docs: complete missing prop of checkbox

* docs: complete missing prop of checkbox
diff --git a/components/checkbox/index.en-US.md b/components/checkbox/index.en-US.md
@@ -24,6 +24,7 @@ Checkbox component.
 | checked(v-model) | Specifies whether the checkbox is selected. | boolean | false   |         |
 | disabled         | Disable checkbox                            | boolean | false   |         |
 | indeterminate    | indeterminate checked state of checkbox     | boolean | false   |         |
+| value            | value of checkbox in CheckboxGroup          | boolean \| string \| number | - |  |
 
 #### events
 
diff --git a/components/checkbox/index.zh-CN.md b/components/checkbox/index.zh-CN.md
@@ -25,6 +25,7 @@ cover: https://gw.alipayobjects.com/zos/alicdn/8nbVbHEm_/CheckBox.svg
 | checked(v-model) | 指定当前是否选中                        | boolean | false  |      |
 | disabled         | 失效状态                                | boolean | false  |      |
 | indeterminate    | 设置 indeterminate 状态，只负责样式控制 | boolean | false  |      |
+| value            | 与 CheckboxGroup 组合使用时的值           | boolean \| string \| number | - |  |
 
 #### 事件
 
