fix: menu cannot be collapsed by the layout

[John60676]

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• Bug fix
• Site / document update
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What's the background?

1. 重现地址：antdv文档-Layout组件-侧边布局
2. 重现方式：菜单组件在展开二级菜单时，折叠Layout sider，子菜单无法跟随折叠.
3. 出现该问题是因为vue3中的 watch options 不再支持 key expressions 的方式使用 [Docs should be clearer about watch option keys not supporting key paths vuejs/core#2003]。因此导致 Menu 组件中无法 watch 到 layoutSiderContext.sCollapsed.

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