Different function signiature for loadExtension function in docs and code

The function signature in the docs is:

```php
public function loadExtension(array $config, ContainerConfigurator $containerConfigurator, ContainerBuilder $containerBuilder): void
```

But in the source code it's

```php
public function loadExtension(array $config, ContainerConfigurator $container, ContainerBuilder $builder): void
```

Pr coming soon