docs: capitalise hash for vue-router docs link (#24948)

docs/2.guide/2.directory-structure/1.pages.md

@@ -263,7 +263,7 @@ Of course, you are welcome to define metadata for your own use throughout your a
 
 #### `alias`
 
-You can define page aliases. They allow you to access the same page from different paths. It can be either a string or an array of strings as defined [here](https://router.vuejs.org/guide/essentials/redirect-and-alias.html#alias) on vue-router documentation.
+You can define page aliases. They allow you to access the same page from different paths. It can be either a string or an array of strings as defined [here](https://router.vuejs.org/guide/essentials/redirect-and-alias.html#Alias) on vue-router documentation.
 
 #### `keepalive`