update doc

examples/docs/en-US/table.md

@@ -1500,6 +1500,7 @@ When the row content is too long and you do not want to display the horizontal s
 | align | alignment | string | left/center/right | left |
 | header-align | alignment of the table header. If omitted, the value of the above `align` attribute will be applied | String | left/center/right | — |
 | class-name | class name of cells in the column | string | — | — |
+| label-class-name | class name of cells in the current title | string | — | — |
 | selectable | function that determines if a certain row can be selected, works when `type` is 'selection' | Function(row, index) | — | — |
 | reserve-selection | whether to reserve selection after data refreshing, works when `type` is 'selection' | boolean | — | false |
 | filters | an array of data filtering options. For each element in this array, `text` and `value` are required | Array[{ text, value }] | — | — |

examples/docs/zh-CN/table.md

@@ -1583,6 +1583,7 @@
 | align | 对齐方式 | String | left/center/right | left |
 | header-align | 表头对齐方式，若不设置该项，则使用表格的对齐方式 | String | left/center/right | — |
 | class-name | 列的 className | string | — | — |
+| label-class-name | 当前标题的 className | string | — | — |
 | selectable | 仅对 type=selection 的列有效，类型为 Function，Function 的返回值用来决定这一行的 CheckBox 是否可以勾选 | Function(row, index) | — | — |
 | reserve-selection | 仅对 type=selection 的列有效，类型为 Boolean，为 true 则代表会保留之前数据的选项，需要配合 Table 的 clearSelection 方法使用。 | Boolean | — | false |
 | filters | 数据过滤的选项，数组格式，数组中的元素需要有 text 和 value 属性。 | Array[{ text, value }] | — | — |