Clarify inline help text

[MiConnell]

Problem

The current help text for --inline (Pass SQL inline to dbt compile and show) reads like an incomplete sentence, like ...and show {something} as opposed to ...and 'dbt show'

Solution

Specify what show means, like the --output help text does

Checklist

• I have read the contributing guide and understand what's expected of me.
• I have run this code in development, and it appears to resolve the stated issue.

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[github-actions]

Thank you for your pull request! We could not find a changelog entry for this change. For details on how to document a change, see the contributing guide.

[MiConnell]

CLA and Changelog updated