update tree docs for children & isLeaf (#9739)

examples/docs/en-US/tree.md

@@ -1023,9 +1023,9 @@ Only one node among the same level can be expanded at one time.
 | Attribute | Description                              | Type   | Accepted Values | Default |
 | --------- | ---------------------------------------- | ------ | --------------- | ------- |
 | label     | specify which key of node object is used as the node's label | string, function(data, node) | —               | —       |
-| children | specify which node object is used as the node's subtree | string, function(data, node) | —               | —       |
+| children | specify which node object is used as the node's subtree | string | —               | —       |
 | disabled | specify which key of node object represents if node's checkbox is disabled | boolean, function(data, node) | —    | —    |
-| isLeaf | specify whether the node is a leaf node | boolean, function(data, node) | —    | —    |
+| isLeaf | specify whether the node is a leaf node, only works when lazy load is enabled | boolean, function(data, node) | —    | —    |
 
 ### Method
 `Tree` has the following method, which returns the currently selected array of nodes.

examples/docs/es/tree.md

@@ -13,7 +13,7 @@
     .buttons {
       margin-top: 20px;
     }
-    
+
     .filter-tree {
       margin-top: 20px;
     }
@@ -1022,8 +1022,8 @@ Solo puede ser expandido un nodo del mismo nivel a la vez.
 | Atributo | Descripción                              | Tipo                          | Valores aceptados | Por defecto |
 | -------- | ---------------------------------------- | ----------------------------- | ----------------- | ----------- |
 | label    | Especifica que clave del objecto nodo se utilizará como label | string, function(data, node)  | —                 | —           |
-| children | Especifica que objeto del nodo se utiliza como subárbol | string, function(data, node)  | —                 | —           |
-| isLeaf   | Especifica si el nodo es una hoja        | boolean, function(data, node) | —                 | —           |
+| children | Especifica que objeto del nodo se utiliza como subárbol | string | —                 | —           |
+| isLeaf   | Especifica si el nodo es una hoja, only works when lazy load is enabled        | boolean, function(data, node) | —                 | —           |
 
 ### Métodos
 `Tree` tiene los siguientes métodos, que devuelven el array de nodos seleccionados.

examples/docs/zh-CN/tree.md

@@ -1022,9 +1022,9 @@
 | 参数       | 说明                | 类型     | 可选值  | 默认值  |
 | -------- | ----------------- | ------ | ---- | ---- |
 | label    | 指定节点标签为节点对象的某个属性值 | string, function(data, node) | —    | —    |
-| children | 指定子树为节点对象的某个属性值 | string, function(data, node) | —    | —    |
+| children | 指定子树为节点对象的某个属性值 | string | —    | —    |
 | disabled | 指定节点选择框是否禁用为节点对象的某个属性值 | boolean, function(data, node) | —    | —    |
-| isLeaf | 指定节点是否为叶子节点 | boolean, function(data, node) | —    | —    |
+| isLeaf | 指定节点是否为叶子节点，仅在指定了 lazy 属性的情况下生效 | boolean, function(data, node) | —    | —    |
 
 ### 方法
 `Tree` 内部使用了 Node 类型的对象来包装用户传入的数据，用来保存目前节点的状态。