a-tree中TreeNode中的isLeaf当前版本默认为true，官网文档里写的默认为false

[muyeluoluo]

• I have searched the issues of this repository and believe that this is not a duplicate.

Version

4.2.3

Environment

vue3

Reproduction link

https://next.antdv.com/components/tree-cn#api

Steps to reproduce

使用a-tree的时候，配置了treeData，并且里面有children，但是页面上始终没有渲染子级，看了很久才发现是isLeaf的问题

What is expected?

期望将isLeaf的默认值改回false，或者将官网文档修改一下。因为很容易误导使用者，且这个问题不太好发现。

What is actually happening?

TreeNode 的isLeaf官网写着默认值为false，但实际默认值为true

[github-actions]

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