doc: update tree switchIcon props type description (#5485)

Co-authored-by: xzp <xingzepeng@geo-compass.com>

components/tree/index.en-US.md

@@ -35,7 +35,7 @@ Almost anything can be represented in a tree structure. Examples include directo
 | selectedKeys(v-model) | (Controlled) Specifies the keys of the selected treeNodes | string\[] \| number\[] | - |  |
 | 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}(3.0+) | false |  |
-| switcherIcon | customize collapse/expand icon of tree node | slot | - |  |
+| switcherIcon | customize collapse/expand icon of tree node | v-slot:switcherIcon="{active, checked, expanded, loading, selected, halfChecked, title, key, children, dataRef, data, defaultIcon, switcherCls}" | - |  |
 | title | custom title | slot |  | 2.0.0 |
 | treeData | treeNode of tree, please use `treeNodes` before v1.1.4 | [TreeNode\[\]](#TreeNode) | - |  |
 | virtual | Disable virtual scroll when set to false | boolean | true | 3.0 |

components/tree/index.zh-CN.md

@@ -36,7 +36,7 @@ cover: https://gw.alipayobjects.com/zos/alicdn/Xh-oWqg9k/Tree.svg
 | selectedKeys(v-model) | （受控）设置选中的树节点 | string\[] \| number\[] | - |  |  |
 | 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}(3.0+) | false |  |  |
-| switcherIcon | 自定义树节点的展开/折叠图标 | slot | - |  |  |
+| switcherIcon | 自定义树节点的展开/折叠图标 | v-slot:switcherIcon="{active, checked, expanded, loading, selected, halfChecked, title, key, children, dataRef, data, defaultIcon, switcherCls}" | - |  |  |
 | title | 自定义标题 | slot |  | 2.0.0 |  |
 | treeData | treeNodes 数据，如果设置则不需要手动构造 TreeNode 节点（key 在整个树范围内唯一） | [TreeNode\[\]](#TreeNode) | -- |  |  |
 | virtual | 设置 false 时关闭虚拟滚动 | boolean | true | 3.0 |  |