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Enter a descriptive title (above) relating to class RouteSubscriber, then describe the problem you have found:
The class documentation for this class just says "Listens to the dynamic route events.". This doesn't really tell me what the class does. It would be better if it (with the corrected verb tense!) used the documentation from its method, which at least tells me it is providing dynamic routes for the block module, which is what the class actually does.