[dependency-injection] Show how to get $myService

[tacman]

from https://symfony.com/doc/current/service_container/service_subscribers_locators.html#using-service-locators-in-compiler-passes

public function process(ContainerBuilder $container): void
{
    // ...

    $locateableServices = [
        // ...
        'logger' => new Reference('logger'),
    ];

    $myService->addArgument(ServiceLocatorTagPass::register($container, $locateableServices));
}

Could you please update the documentation to show how to get $myService?

I tried

$container->get(MyService::class)

but that's not right. Thanks.

@weaverryan or anyone else, if you answer here, I'll add it and make a PR.