docs: update definePageMeta docs (#7888)

docs/content/3.api/3.utils/define-page-meta.md

@@ -19,6 +19,8 @@
 definePageMeta(meta: PageMeta) => void
 
 interface PageMeta {
+  redirect?: RouteRecordRedirectOption
+  alias?: string | string[]
   pageTransition?: boolean | TransitionProps
   layoutTransition?: boolean | TransitionProps
   key?: false | string | ((route: RouteLocationNormalizedLoaded) => string)
@@ -73,6 +75,20 @@ interface PageMeta {
 
     Define anonymous or named middleware directly within `definePageMeta`. Learn more about [route middleware](/docs/directory-structure/middleware).
 
+  **`redirect`**
+
+  - **Type**: [`RouteRecordRedirectOption`](https://router.vuejs.org/guide/essentials/redirect-and-alias.html#redirect-and-alias)
+
+    Where to redirect if the route is directly matched. The redirection happens before any navigation guard and triggers a new navigation with the new target location.
+
+    :StabilityEdge
+
+  **`alias`**
+
+  - **Type**: `string | string[]`
+  
+    Aliases for the record. Allows defining extra paths that will behave like a copy of the record. Allows having paths shorthands like `/users/:id` and `/u/:id`. All `alias` and `path` values must share the same params.
+
   **`[key: string]`**
 
   - **Type**: `any`