Table: update header-align docs

examples/docs/en-US/table.md

@@ -1413,6 +1413,7 @@ Customize table column so it can be integrated with other components.
 | context | context of Table-column, e.g. `_self` refers to the current context, `$parent` parent context, `$root` root context | Object | - | current context where Table lies |
 | inline-template | by using this attribute, you can customize column template. Row data can be accessed by `row` object. In your template, you have access to the following: `{ row (current row), column (current column), $index (row index), store (table store) }` | — | — |
 | 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 | — | — |
 | 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 |

examples/docs/zh-CN/table.md

@@ -1420,8 +1420,8 @@
 | show-overflow-tooltip | 当内容过长被隐藏时显示 tooltip | Boolean | — | false |
 | context | 设置上下文环境，例如设置当前上下文就是 `_self`，父级就是 `$parent`，根组件 `$root` | Object | - | Table 所处上下文 |
 | inline-template | 指定该属性后可以自定义 column 模板，参考多选的时间列，通过 row 获取行信息。总共可以获取到 `{ row(当前行), column(当前列), $index(行数), store(table store) }` 以及 Table 所处的上下文环境。 | — | — |
-| 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 | — |
+| 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 | — | — |
 | 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 |