docs(tree): add FAQ description valueMode = 'all' (#1970)

* docs(tree): add `FAQ` description `valueMode = 'all'` * chore: 优化 `FAQ` 标题 * chore: 修改翻译
Tencent · Oct 31, 2024 · bc9f1b4 · bc9f1b4
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diff --git a/docs/web/api/tree.en-US.md b/docs/web/api/tree.en-US.md
@@ -105,3 +105,9 @@ Connects parent nodes in the tree with their child nodes at the same level. This
 ### Virtual Scrolling
 
 {{ vscroll }}
+
+## FAQ
+
+### Why doesn't the `onChange` callback return the value of the parent node when child node is selected in `valueMode = 'all'` mode?
+
+In `valueMode = 'all'` mode, the parent node will only appear in the selected values if all its child nodes are selected.
diff --git a/docs/web/api/tree.md b/docs/web/api/tree.md
@@ -109,3 +109,9 @@ spline: data
 ### 虚拟滚动
 
 {{ vscroll }}
+
+## FAQ
+
+### 为什么在 `valueMode = 'all'` 模式下，选中子节点时 `onChange` 回调并没有返回父节点的值？
+
+在 `valueMode = 'all'` 模式下,必须当前子节点被全部选中后,父节点才会出现在选中值里面。