docs(DatePicker): updating deprecated API (#7570)

components/date-picker/index.en-US.md

@@ -85,7 +85,7 @@ The following APIs are shared by DatePicker, RangePicker.
 | disabled | Determine whether the DatePicker is disabled | boolean | false |  |
 | disabledDate | Specify the date that cannot be selected | (currentDate: dayjs) => boolean | - |  |
 | format | To set the date format, refer to [dayjs](https://day.js.org/). When an array is provided, all values are used for parsing and first value is used for formatting, support [Custom Format](#components-date-picker-demo-format) | [formatType](#formattype) | `YYYY-MM-DD` |  |
-| dropdownClassName | To customize the className of the popup calendar | string | - |  |
+| popupClassName | To customize the className of the popup calendar | string | - |  |
 | getPopupContainer | To set the container of the floating layer, while the default is to create a `div` element in `body` | function(trigger) | - |  |
 | inputReadOnly | Set the `readonly` attribute of the input tag (avoids virtual keyboard on touch devices) | boolean | false |  |
 | locale | Localization configuration | object | [default](https://github.com/vueComponent/ant-design-vue/blob/main/components/date-picker/locale/example.json) |  |

components/date-picker/index.zh-CN.md

@@ -86,7 +86,7 @@ coverDark: https://mdn.alipayobjects.com/huamei_7uahnr/afts/img/A*3OpRQKcygo8AAA
 | disabled | 禁用 | boolean | false |  |
 | disabledDate | 不可选择的日期 | (currentDate: dayjs) => boolean | - |  |
 | format | 设置日期格式，为数组时支持多格式匹配，展示以第一个为准。配置参考 [dayjs](https://day.js.org/docs/zh-CN/display/format)，支持[自定义格式](#components-date-picker-demo-format) | [formatType](#formattype) | `YYYY-MM-DD` |  |
-| dropdownClassName | 额外的弹出日历 className | string | - |  |
+| popupClassName | 额外的弹出日历 className | string | - |  |
 | getPopupContainer | 定义浮层的容器，默认为 body 上新建 div | function(trigger) | - |  |
 | inputReadOnly | 设置输入框为只读（避免在移动设备上打开虚拟键盘） | boolean | false |  |
 | locale | 国际化配置 | object | [默认配置](https://github.com/vueComponent/ant-design-vue/blob/main/components/date-picker/locale/example.json) | - |