Add missing link to admin-guide on translations (medusajs#5665)

Added missing link. @shahednasser can see you often use markdown references for other links, let me know if you prefer my submissions to be in similar format.

www/apps/docs/content/admin/quickstart.mdx

@@ -167,7 +167,7 @@ You can learn more about the admin dashboard and its features in the [User Guide
 
 Medusa supports multiple languages and translations.
 
-Refer to this user guide to learn how to switch the language of the Medusa admin.
+Refer to [this user guide](../user-guide/users/profile.md#change-admin-language) to learn how to switch the language of the Medusa admin.
 
 :::note