Update documentation/docs/30-advanced/25-errors.md

documentation/docs/30-advanced/25-errors.md

@@ -127,7 +127,7 @@ The exception is when the error occurs inside the root `+layout.js` or `+layout.
 If you're using TypeScript and need to customize the shape of errors, you can do so by declaring an `App.Error` interface in your app (by convention, in `src/app.d.ts`, though it can live anywhere that TypeScript can 'see'):
 
 ```ts
-/// file: /src/app.d.ts
+/// file: src/app.d.ts
 declare global {
 	namespace App {
 		interface Error {