Update super-admin.md

As a first time reader of the package documentation (which by the way is really good!), I realized that in the seeding example we use 'super-admin'.  I haven't tried it yet, but I believe these two should be consistent to work, so I propose we change it here to super-admin as well.

docs/basic-usage/super-admin.md

@@ -9,7 +9,7 @@ Then you can implement the best-practice of primarily using permission-based con
 
 
 ## `Gate::before`
-If you want a "Super Admin" role to respond `true` to all permissions, without needing to assign all those permissions to a role, you can use [Laravel's `Gate::before()` method](https://laravel.com/docs/master/authorization#intercepting-gate-checks). For example:
+If you want a "super-admin" role to respond `true` to all permissions, without needing to assign all those permissions to a role, you can use [Laravel's `Gate::before()` method](https://laravel.com/docs/master/authorization#intercepting-gate-checks). For example:
 
 In Laravel 11 this would go in the `boot()` method of `AppServiceProvider`:
 In Laravel 10 and below it would go in the `boot()` method of `AuthServiceProvider.php`:
@@ -18,10 +18,10 @@ use Illuminate\Support\Facades\Gate;
 // ...
 public function boot()
 {
-    // Implicitly grant "Super Admin" role all permissions
+    // Implicitly grant "super-admin" role all permissions
     // This works in the app by using gate-related functions like auth()->user->can() and @can()
     Gate::before(function ($user, $ability) {
-        return $user->hasRole('Super Admin') ? true : null;
+        return $user->hasRole('super-admin') ? true : null;
     });
 }
 ```
@@ -44,7 +44,7 @@ use App\Models\User; // could be any Authorizable model
  */
 public function before(User $user, string $ability): bool|null
 {
-    if ($user->hasRole('Super Admin')) {
+    if ($user->hasRole('super-admin')) {
         return true;
     }
 
@@ -62,6 +62,6 @@ The following code snippet is inspired from [Freek's blog article](https://freek
 // somewhere in a service provider
 
 Gate::after(function ($user, $ability) {
-   return $user->hasRole('Super Admin'); // note this returns boolean
+   return $user->hasRole('super-admin'); // note this returns boolean
 });
 ```