doc: update tree-select doc

Author: tangjinzhou

components/tree-select/demo/replaceFields.vue

@@ -29,7 +29,6 @@ Replace the title,key and children fields in treeNode with the corresponding fie
     :field-names="{
       children: 'children',
       label: 'name',
-      key: 'key',
       value: 'value',
     }"
   ></a-tree-select>

components/tree-select/index.en-US.md

@@ -34,7 +34,7 @@ Tree selection control.
 | multiple | Support multiple or not, will be `true` when enable `treeCheckable`. | boolean | false |  |  |
 | notFoundContent | Specify content to show when no result matches | slot | `Not Found` |  |  |
 | placeholder | Placeholder of the select input | string\|slot | - |  |  |
-| replaceFields | Replace the title,value, key and children fields in treeNode with the corresponding fields in treeData | object | { children:'children', label:'title', key:'key', value: 'value' } |  | 1.6.1 (3.0.0 deprecated) |
+| replaceFields | Replace the title,value, key and children fields in treeNode with the corresponding fields in treeData | object | { children:'children', label:'title', value: 'value' } |  | 1.6.1 (3.0.0 deprecated) |
 | searchPlaceholder | Placeholder of the search input | string\|slot | - |  |  |
 | searchValue(v-model) | work with `search` event to make search value controlled. | string | - |  |  |
 | showCheckedStrategy | The way show selected item in box. **Default:** just show child nodes. **`TreeSelect.SHOW_ALL`:** show all checked treeNodes (include parent treeNode). **`TreeSelect.SHOW_PARENT`:** show checked treeNodes (just show parent treeNode). | enum { TreeSelect.SHOW_ALL, TreeSelect.SHOW_PARENT, TreeSelect.SHOW_CHILD } | TreeSelect.SHOW_CHILD |  |  |

components/tree-select/index.zh-CN.md

@@ -24,7 +24,7 @@ cover: https://gw.alipayobjects.com/zos/alicdn/Ax4DA0njr/TreeSelect.svg
 | dropdownClassName | 下拉菜单的 className 属性 | string | - |  |  |
 | dropdownMatchSelectWidth | 下拉菜单和选择器同宽。默认将设置 `min-width`，当值小于选择框宽度时会被忽略。false 时会关闭虚拟滚动 | boolean \| number | true |  |  |
 | dropdownStyle | 下拉菜单的样式 | object | - |  |  |
-| fieldNames | 替换 treeNode 中 title,value,key,children 字段为 treeData 中对应的字段 | object | {children:'children', label:'title', key:'key', value: 'value' } |  | 3.0.0 |
+| fieldNames | 替换 treeNode 中 title,value,key,children 字段为 treeData 中对应的字段 | object | {children:'children', label:'title', value: 'value' } |  | 3.0.0 |
 | filterTreeNode | 是否根据输入项进行筛选，默认用 treeNodeFilterProp 的值作为要筛选的 TreeNode 的属性值 | boolean\|Function(inputValue: string, treeNode: TreeNode) (函数需要返回 bool 值) | Function |  |  |
 | getPopupContainer | 菜单渲染父节点。默认渲染到 body 上，如果你遇到菜单滚动定位问题，试试修改为滚动的区域，并相对其定位。 | Function(triggerNode) | () => document.body |  |  |
 | labelInValue | 是否把每个选项的 label 包装到 value 中，会把 value 类型从 `string` 变为 `{value: string, label: VNode, halfChecked(treeCheckStrictly 时有效): string[] }` 的格式 | boolean | false |  |  |