Update routing.md

append the origin of pure.html

docs/guide/routing.md

@@ -105,6 +105,12 @@ If you want to link to a page in your site that is not generated by VitePress, y
 [Link to pure.html](/pure.html){target="_self"}
 ```
 
+::: tip Note
+
+The example page named `pure.html` is created in [the public directory](https://vitepress.dev/guide/asset-handling#the-public-directory)
+
+:::
+
 **Output**
 
 [Link to pure.html](/pure.html){target="_self"}