docs: update table ajax demo

Author: tangjinzhou

components/table/__tests__/Table.filter.test.js

@@ -259,7 +259,7 @@ describe('Table.filter', () => {
     })
     await asyncExpect(() => {
       $$('.ant-dropdown-menu-submenu-title')[1].dispatchEvent(new MouseEvent('mouseenter'))
-    }, 500)
+    }, 1000)
     await asyncExpect(() => {
       const menuItem = $$('.ant-dropdown-menu-item')
       menuItem[menuItem.length - 1].click()

components/table/demo/ajax.md

@@ -14,7 +14,7 @@ This example shows how to fetch and present data from remote server, and how to
 ```html
 <template>
   <a-table :columns="columns"
-    :rowKey="record => record.registered"
+    :rowKey="record => record.login.uuid"
     :dataSource="data"
     :pagination="pagination"
     :loading="loading"