docs: add `name` param to `PageMeta` interface description (#23107)

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

@@ -25,6 +25,7 @@ definePageMeta(meta: PageMeta) => void
 interface PageMeta {
   validate?: (route: RouteLocationNormalized) => boolean | Promise<boolean> | Partial<NuxtError> | Promise<Partial<NuxtError>>
   redirect?: RouteRecordRedirectOption
+  name?: string
   path?: string
   alias?: string | string[]
   pageTransition?: boolean | TransitionProps
@@ -46,6 +47,12 @@ interface PageMeta {
 
   An object accepting the following page metadata:
 
+  **`name`**
+
+  - **Type**: `string`
+
+    You may define a name for this page's route. By default, name is generated based on path inside the [`pages/` directory](/docs/guide/directory-structure/pages).
+
   **`path`**
 
   - **Type**: `string`