Update docs/docs/guides/tutorials/userId.mdx

Suggesting the user where to use the function instead of specifying it
Commit Type: docs

Co-authored-by: Frederic Jahn <[email protected]>

docs/docs/guides/tutorials/userId.mdx

@@ -78,6 +78,6 @@ async function getEmail() {
 }
 ```
 
-And call `getEmail()` inside of the callback used to redirect after a successful authentication:
+And call `getEmail()` where you need the user data (e.g. a navigation bar, etc).