docs: fix description error

Author: gweesin

examples/sites/demos/pc/app/grid/webdoc/grid-tree-table.js

@@ -100,10 +100,8 @@ export default {
       'demoId': 'tree-table-tree-grid-expand',
       'name': { 'zh-CN': '获取展开的行数据', 'en-US': 'Get the expanded row data' },
       'desc': {
-        'zh-CN':
-          '<p>通过 <code>getTreeExpandeds</code> 方法可以获取展开的行数据，参数 <code>row</code> 为行数据对象。</p>\n',
-        'en-US':
-          '<p>You can use the <code>getTreeExpandeds</code> method to get the expanded row data. The row parameter indicates the row data object. </p>\n'
+        'zh-CN': '<p>通过 <code>getTreeExpandeds</code> 方法可以获取展开的行数据</p>',
+        'en-US': '<p>You can use the <code>getTreeExpandeds</code> method to get the expanded row data</p>'
       },
       'codeFiles': ['tree-table/tree-table-tree-grid-expand.vue']
     },