📝 Add doc about Input[allowClear]

components/input/index.en-US.md

@@ -30,6 +30,7 @@ Keyboard and mouse can be used for providing or changing data.
 | value | The input content value | string |  |
 | onChange | callback when user input | function(e) | |
 | onPressEnter | The callback function that is triggered when Enter key is pressed. | function(e) |  |
+| allowClear | allow to remove input content with clear icon | boolean | |
 
 > When `Input` is used in a `Form.Item` context, if the `Form.Item` has the `id` and `options` props defined
 > then `value`, `defaultValue`, and `id` props of `Input` are automatically set.

components/input/index.zh-CN.md

@@ -30,6 +30,7 @@ title: Input
 | value | 输入框内容 | string |  |
 | onChange | 输入框内容变化时的回调 | function(e) | |
 | onPressEnter | 按下回车的回调 | function(e) |  |
+| allowClear | 可以点击清除图标删除内容 | boolean | |
 
 > 如果 `Input` 在 `Form.Item` 内，并且 `Form.Item` 设置了 `id` 和 `options` 属性，则 `value` `defaultValue` 和 `id` 属性会被自动设置。