Update introduction.md

Author: drbyte

docs/introduction.md

@@ -17,7 +17,7 @@ $user->assignRole('writer');
 $role->givePermissionTo('edit articles');
 ```
 
-If you're using multiple guards we've got you covered as well. Every guard will have its own set of permissions and roles that can be assigned to the guard's users. Read about it in the [using multiple guards](/v3/basic-usage/multiple-guards) section of the readme.
+If you're using multiple guards we've got you covered as well. Every guard will have its own set of permissions and roles that can be assigned to the guard's users. Read about it in the [using multiple guards](https://docs.spatie.be/laravel-permission/v3/basic-usage/multiple-guards/) section of the readme.
 
 Because all permissions will be registered on [Laravel's gate](https://laravel.com/docs/authorization), you can check if a user has a permission with Laravel's default `can` function: