Update 08-parallel-routes.mdx (#52419)

I Belive this is the incorrect location for the default.js in this
example it should be in app/@authModal/default.js not
app/@authModal/login/default.js

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docs/02-app/01-building-your-application/01-routing/08-parallel-routes.mdx

@@ -220,13 +220,13 @@ export default function Login() {
 
 To ensure that the contents of the modal don't get rendered when it's not active, you can create a `default.js` file that returns `null`.
 
-```tsx filename="app/@authModal/login/default.tsx" switcher
+```tsx filename="app/@authModal/default.tsx" switcher
 export default function Default() {
   return null
 }
 ```
 
-```jsx filename="app/@authModal/login/default.js" switcher
+```jsx filename="app/@authModal/default.js" switcher
 export default function Default() {
   return null
 }