DisplayRouterInterface documents an unused 'uses_routes' property

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Thank you!

Added comment to MR.

@alexpott ah did not spot that at all - do you think we should deprecate these Views flags and Views::getApplicableViews() and replace with interfaces?

@longwave well we'd need to create instances of the plugins for that - I guess it will work. Having both the interface and the flag is fun and v drupal.

@alexpott no we can determine interfaces from the class name alone with is_a().