Add missing attributes, fix response codes, fix route parameter casing

Jellyfin.Api/Controllers/DevicesController.cs

@@ -133,6 +133,7 @@ namespace Jellyfin.Api.Controllers
         /// <returns>A <see cref="NoContentResult"/> on success, or a <see cref="NotFoundResult"/> if the device could not be found.</returns>
         [HttpDelete]
         [ProducesResponseType(StatusCodes.Status204NoContent)]
+        [ProducesResponseType(StatusCodes.Status404NotFound)]
         public ActionResult DeleteDevice([FromQuery, BindRequired] string id)
         {
             var existingDevice = _deviceManager.GetDevice(id);