[11.x] Document when method of ThrottlesExceptions middleware (laravel#9551)

* Document `when` method of ThrottlesExceptions middleware

* Update queues.md

---------

Co-authored-by: Taylor Otwell <[email protected]>

Author: JaZo

queues.md

@@ -656,6 +656,23 @@ Internally, this middleware uses Laravel's cache system to implement rate limiti
         return [(new ThrottlesExceptions(10, 10))->by('key')];
     }
 
+By default, this middleware will throttle every exception. You can modify this behaviour by invoking the `when` method when attaching the middleware to your job. The exception will then only be throttled if closure provided to the `when` method returns `true`:
+
+    use Illuminate\Http\Client\HttpClientException;
+    use Illuminate\Queue\Middleware\ThrottlesExceptions;
+
+    /**
+     * Get the middleware the job should pass through.
+     *
+     * @return array<int, object>
+     */
+    public function middleware(): array
+    {
+        return [(new ThrottlesExceptions(10, 10))->when(
+            fn (Throwable $throwable) => $throwable instanceof HttpClientException
+        )];
+    }
+
 > [!NOTE]  
 > If you are using Redis, you may use the `Illuminate\Queue\Middleware\ThrottlesExceptionsWithRedis` middleware, which is fine-tuned for Redis and more efficient than the basic exception throttling middleware.