docs: update menu doc, add triggerSubMenuAction description (#5202)

Author: chaegumi

components/menu/index.en-US.md

@@ -44,6 +44,7 @@ More layouts with navigation: [Layout](/components/layout).
 | subMenuOpenDelay | delay time to show submenu when mouse enter, unit: second | number | 0 |
 | theme | color theme of the menu | string: `light` `dark` | `light` |
 | overflowedIndicator | Customized icon when menu is collapsed | DOM | `<span>···</span>` |
+| triggerSubMenuAction | method of trigger submenu | `click` \| `hover` | `hover` |
 
 ### Menu Events
 

components/menu/index.zh-CN.md

@@ -44,6 +44,7 @@ cover: https://gw.alipayobjects.com/zos/alicdn/3XZcjGpvK/Menu.svg
 | subMenuOpenDelay | 用户鼠标进入子菜单后开启延时，单位：秒 | number | 0 |
 | theme | 主题颜色 | string: `light` `dark` | `light` |
 | overflowedIndicator | 自定义 Menu 折叠时的图标 | DOM | `<span>···</span>` |
+| triggerSubMenuAction | 修改 Menu 子菜单的触发方式 | `click` \| `hover` | `hover` |
 
 ### Menu 事件