Adds missing comma to dbt compile help text

[sethwoodworth]

resolves #2388

Description

Adds a comma to the help text for dbt compile

Checklist

• I have signed the CLA
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• I have updated the CHANGELOG.md and added information about my change to the "dbt next" section.

[cla-bot]

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[beckjake]

@cla-bot check

[cla-bot]

The cla-bot has been summoned, and re-checked this pull request!

[beckjake]

Thanks for bringing this to our attention @sethwoodworth! I think this message actually predates the existence of "sources" in dbt and the "source" there is referring to the concept of those SQL files as "source code".

This is copy-related, so cc @drewbanin - what should this actually say?

[drewbanin]

ha - you're right @beckjake - this does predate sources in dbt. Either way though, I think the copy here LGTM :)

[drewbanin]

@sethwoodworth if you're able to update the CHANGELOG.md file, we can get this merged! It's a small change, but we want to make sure you get credit for it in the release notes :)

Thanks again for the attention to detail here!

[sethwoodworth]

@drewbanin PR updated with CHANGELOG.md addition 👍

[beckjake]

I've kicked off the test suite (though it's more of a formality in this PR's case). Once they pass, I'll merge this. Thanks for your contribution @sethwoodworth!