docs: Add Table missing expandIconColumnIndex in doc

close #21803

components/table/index.en-US.md

@@ -165,6 +165,7 @@ Properties for expandable.
 | defaultExpandAllRows | Expand all rows initially | boolean | `false` |
 | defaultExpandedRowKeys | Initial expanded row keys | string\[] | - |
 | expandIcon | Customize row expand Icon. Ref [example](https://codesandbox.io/s/fervent-bird-nuzpr) | Function(props):ReactNode | - |
+| expandIconColumnIndex | Customize expand icon column index | number | - |
 | expandedRowKeys | Current expanded row keys | string\[] | - |
 | expandedRowRender | Expanded container render for each row | Function(record, index, indent, expanded):ReactNode | - |
 | expandRowByClick | Whether to expand row by clicking anywhere in the whole row | boolean | `false` |

components/table/index.zh-CN.md

@@ -170,6 +170,7 @@ const columns = [
 | defaultExpandAllRows | 初始时，是否展开所有行 | boolean | false |
 | defaultExpandedRowKeys | 默认展开的行 | string\[] | - |
 | expandIcon | 自定义展开图标，参考[示例](https://codesandbox.io/s/fervent-bird-nuzpr) | Function(props):ReactNode | - |
+| expandIconColumnIndex | 自定义展开按钮的列顺序 | number | - |
 | expandedRowKeys | 展开的行，控制属性 | string\[] | - |
 | expandedRowRender | 额外的展开行 | Function(record, index, indent, expanded):ReactNode | - |
 | expandRowByClick | 通过点击行来展开子行 | boolean | `false` |