ContainerInjectionInterface docs need update

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The docs for this interface ContainerInjectionInterface look like they were just left over from when it maybe was named ControllerInterface or copy/pasted from there. They need to be updated to reflect what the interface actually does/is/should be used for.

As this documentation is pretty much unrelated to the class (assuming that the name is a sensible choice), it's a major bug, especially since every route controller class is supposed to extend this interface so it's fairly prominent.