Да, нормально
```ruby
# ок
Exceptions_404 = [
    ActionController::RoutingError,
    ActionController::UnknownController
    ...
]

# ок
Exceptions_404 = ActionController::RoutingError,
                 ActionController::UnknownController,
                 ...

# не ок
Exceptions_404 = [ActionController::RoutingError,
                  ActionController::UnknownController,
                  ...]
```