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There are a few references to "subcommands" in the repository, but no explanation of what they are. Beef up the docblock for `shouldRunAsSubcommand()` to make things a little clearer. Specifically, I'd like to make the difference between driver jobs and driver subcomnmands clearer. In addition, remove a double negative comment, "If we are not run as 'swift', don't do anything special", and replace it with something a little clearer (in my opinion).