[DependencyInjection] Fix YAML example in "Defining a Service Locator" section

[jbieliauskas]

Using this example in v5.3.13 gives this error:

Symfony\Component\DependencyInjection\Definition::setArguments(): Argument #1 ($arguments) must be of type array, Symfony\Component\DependencyInjection\Argument\ServiceLocatorArgument given, called in /project/vendor/symfony/dependency-injection/Loader/YamlFileLoader.php on line 527

I assume this is because !service_locator is the first constructor argument but it's passed as an array of constructor arguments, in which case the example is not right.

[javiereguiluz]

Good catch Justas! Thanks and congrats on your first Symfony Docs contribution 🎉

[jbieliauskas]

@javiereguiluz Will this change be applied to other versions like 5.x, 6.x?

[javiereguiluz]

Yes, it should be already in all upper and maintained branches. We "upmerge" all Pull Requests. Cheers!