docs: add docs for TimePicker[defaultOpenValue], close: #6336

components/time-picker/demo/basic.md

@@ -15,10 +15,14 @@ Click `TimePicker`, and then we could select or input a time in panel.
 
 ````jsx
 import { TimePicker } from 'antd';
+import moment from 'moment';
 
 function onChange(time, timeString) {
   console.log(time, timeString);
 }
 
-ReactDOM.render(<TimePicker onChange={onChange} />, mountNode);
+ReactDOM.render(
+  <TimePicker onChange={onChange} defaultOpenValue={moment('00:00:00', 'HH:mm:ss')} />,
+  mountNode
+);
 ````

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

@@ -23,6 +23,7 @@ import moment from 'moment';
 |---------------------|-----|-----|-------|
 | defaultValue        | to set default time | [moment](http://momentjs.com/) | - |
 | value               | to set time | [moment](http://momentjs.com/) | - |
+| defaultOpenValue    | to highlight values in panel when there is no selected value | [moment](http://momentjs.com/) | moment() |
 | open                | whether to popup panel | boolean | false |
 | onOpenChange        | a callback function which will be called while panel opening/closing | (open: boolean): void | - |
 | placeholder         | display when there's no value | string | "Select a time" |

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

@@ -24,6 +24,7 @@ import moment from 'moment';
 |---------------------|-----|-----|-------|
 | defaultValue        | 默认时间 | [moment](http://momentjs.com/) | 无 |
 | value               | 当前时间 | [moment](http://momentjs.com/) | 无 |
+| defaultOpenValue    | 无选中值时，面板打开时高亮的值 | [moment](http://momentjs.com/) | moment() |
 | open                | 面板是否打开 | boolean | false |
 | onOpenChange        | 面板打开/关闭时的回调 | (open: boolean): void | 无 |
 | placeholder         | 没有值的时候显示的内容 | string | "请选择时间" |