docs: add align prop description (#9749)

components/table/index.en-US.md

@@ -120,6 +120,7 @@ One of the Table `columns` prop for describing the table's columns, Column has t
 | fixed | Set column to be fixed: `true`(same as left) `'left'` `'right'` | boolean\|string | `false` |
 | key | Unique key of this column, you can ignore this prop if you've set a unique `dataIndex` | string | - |
 | render | Renderer of the table cell. The return value should be a ReactNode, or an object for [colSpan/rowSpan config](#components-table-demo-colspan-rowspan) | Function(text, record, index) {} | - |
+| align | specify how content is aligned | 'left' \| 'right' \| 'center' | 'left' |
 | sorter | Sort function for local sort, see [Array.sort](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort)'s compareFunction. If you need sort buttons only, set to `true` | Function\|boolean | - |
 | sortOrder | Order of sorted values: `'ascend'` `'descend'` `false` | boolean\|string | - |
 | title | Title of this column | string\|ReactNode | - |

components/table/index.zh-CN.md

@@ -121,6 +121,7 @@ const columns = [{
 | fixed | 列是否固定，可选 `true`(等效于 left) `'left'` `'right'` | boolean\|string | false |
 | key | React 需要的 key，如果已经设置了唯一的 `dataIndex`，可以忽略这个属性 | string | - |
 | render | 生成复杂数据的渲染函数，参数分别为当前行的值，当前行数据，行索引，@return里面可以设置表格[行/列合并](#components-table-demo-colspan-rowspan) | Function(text, record, index) {} | - |
+| align | 设置列内容的对齐方式 | 'left' \| 'right' \| 'center' | 'left' |
 | sorter | 排序函数，本地排序使用一个函数(参考 [Array.sort](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort) 的 compareFunction)，需要服务端排序可设为 true | Function\|boolean | - |
 | sortOrder | 排序的受控属性，外界可用此控制列的排序，可设置为 `'ascend'` `'descend'` `false` | boolean\|string | - |
 | title | 列头显示文字 | string\|ReactNode | - |

components/table/interface.tsx

@@ -13,6 +13,7 @@ export interface ColumnProps<T> {
   key?: React.Key;
   dataIndex?: string;
   render?: (text: any, record: T, index: number) => React.ReactNode;
+  align?: 'left' | 'right' | 'center';
   filters?: ColumnFilterItem[];
   onFilter?: (value: any, record: T) => boolean;
   filterMultiple?: boolean;