docs(components): [date-picker] attribute type description (element-plus#9357)

* docs(components): fix 'date-picker' attribute type description

* docs(components): revert 'date-picker' attribute description

* docs(components): fix 'datetime-picker' attribute type description

* docs(components): fix 'time-picker' attribute type description

* docs(components): format

* docs(components): fix type, optimization description

Author: pany-ang

docs/en-US/component/date-picker.md

@@ -141,7 +141,7 @@ Note, date time locale (month name, first day of the week ...) are also configur
 
 | Attribute             | Description                                                                                           | Type                                             | Accepted Values                                                                                                   | Default     |
 | --------------------- | ----------------------------------------------------------------------------------------------------- | ------------------------------------------------ | ----------------------------------------------------------------------------------------------------------------- | ----------- |
-| model-value / v-model | binding value                                                                                         | date(DatePicker) / array(DateRangePicker)        | —                                                                                                                 | —           |
+| model-value / v-model | binding value, if it is an array, the length should be 2                                              | Date / number / string / Array                   | —                                                                                                                 | —           |
 | readonly              | whether DatePicker is read only                                                                       | boolean                                          | —                                                                                                                 | false       |
 | disabled              | whether DatePicker is disabled                                                                        | boolean                                          | —                                                                                                                 | false       |
 | size                  | size of Input                                                                                         | string                                           | large/default/small                                                                                               | default     |
@@ -154,15 +154,15 @@ Note, date time locale (month name, first day of the week ...) are also configur
 | format                | format of the displayed value in the input box                                                        | string                                           | see [date formats](/en-US/component/date-picker#date-formats)                                                     | YYYY-MM-DD  |
 | popper-class          | custom class name for DatePicker's dropdown                                                           | string                                           | —                                                                                                                 | —           |
 | range-separator       | range separator                                                                                       | string                                           | —                                                                                                                 | '-'         |
-| default-value         | optional, default date of the calendar                                                                | Date                                             | anything accepted by `new Date()`                                                                                 | —           |
-| default-time          | optional, the time value to use when selecting date range                                             | Date[]                                           | Array with length 2, each item is a Date. The first item for the start date and then second item for the end date | —           |
+| default-value         | optional, default date of the calendar                                                                | Date / [Date, Date]                              | —                                                                                                                 | —           |
+| default-time          | optional, the time value to use when selecting date range                                             | Date / [Date, Date]                              | Array with length 2, each item is a Date. The first item for the start date and then second item for the end date | —           |
 | value-format          | optional, format of binding value. If not specified, the binding value will be a Date object          | string                                           | see [date formats](/en-US/component/date-picker#date-formats)                                                     | —           |
-| id                    | same as `id` in native input                                                                          | string / array(string)                           | String `id="my-date"` or array `:id="['my-range-start', 'my-range-end']"` for date range                          | -           |
+| id                    | same as `id` in native input                                                                          | string / array(string)                           | String `id="my-date"` or array `:id="['my-range-start', 'my-range-end']"` for date range                          | —           |
 | name                  | same as `name` in native input                                                                        | string                                           | —                                                                                                                 | —           |
 | unlink-panels         | unlink two date-panels in range-picker                                                                | boolean                                          | —                                                                                                                 | false       |
 | prefix-icon           | custom prefix icon component                                                                          | `string \| Component`                            | —                                                                                                                 | Date        |
 | clear-icon            | custom clear icon component                                                                           | `string \| Component`                            | —                                                                                                                 | CircleClose |
-| validate-event        | whether to trigger form validation                                                                    | boolean                                          | -                                                                                                                 | true        |
+| validate-event        | whether to trigger form validation                                                                    | boolean                                          | —                                                                                                                 | true        |
 | disabled-date         | a function determining if a date is disabled with that date as its parameter. Should return a Boolean | function                                         | —                                                                                                                 | —           |
 | shortcuts             | an object array to set shortcut options                                                               | object[{ text: string, value: date / function }] | —                                                                                                                 | —           |
 | cell-class-name       | set custom className                                                                                  | Function(Date)                                   | —                                                                                                                 | —           |