docs(Tree): update docs (#42989)

* docs: update docs

* docs: update docs

* docs: update docs

components/tree/index.en-US.md

@@ -61,7 +61,7 @@ Almost anything can be represented in a tree structure. Examples include directo
 | rootClassName | ClassName on the root element | string | - | 4.20.0 |
 | rootStyle | Style on the root element | CSSProperties | - | 4.20.0 |
 | selectable | Whether can be selected | boolean | true |  |
-| selectedKeys | (Controlled) Specifies the keys of the selected treeNodes | string\[] | - |  |
+| selectedKeys | (Controlled) Specifies the keys of the selected treeNodes, multiple selection needs to set `multiple` to true | string\[] | - |  |
 | showIcon | Shows the icon before a TreeNode's title. There is no default style; you must set a custom style for it if set to true | boolean | false |  |
 | showLine | Shows a connecting line | boolean \| {showLeafIcon: boolean \| ReactNode \| ((props: AntTreeNodeProps) => ReactNode)} | false |  |
 | switcherIcon | Customize collapse/expand icon of tree node | ReactNode \| ((props: AntTreeNodeProps) => ReactNode) | - | renderProps: 4.20.0 |

components/tree/index.zh-CN.md

@@ -63,7 +63,7 @@ demo:
 | rootClassName | 添加在 Tree 最外层的 className | string | - | 4.20.0 |
 | rootStyle | 添加在 Tree 最外层的 style | CSSProperties | - | 4.20.0 |
 | selectable | 是否可选中 | boolean | true |  |
-| selectedKeys | （受控）设置选中的树节点 | string\[] | - |  |
+| selectedKeys | （受控）设置选中的树节点，多选需设置 `multiple` 为 true | string\[] | - |  |
 | showIcon | 是否展示 TreeNode title 前的图标，没有默认样式，如设置为 true，需要自行定义图标相关样式 | boolean | false |  |
 | showLine | 是否展示连接线 | boolean \| {showLeafIcon: boolean \| ReactNode \| ((props: AntTreeNodeProps) => ReactNode)} | false |  |
 | switcherIcon | 自定义树节点的展开/折叠图标 | ReactNode \| ((props: AntTreeNodeProps) => ReactNode) | - | renderProps: 4.20.0 |