Brian Gesiak 9208154c16 Document what a "subcommand" is ...

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).

2020-04-09 16:42:15 -07:00

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