Documentation: Include information on how to use command line arguments to override single config variables

[georgemccabe]

Describe the Enhancement

This information should be more clearly present towards to top of the Configuration chapter.

Time Estimate

< 4 hours

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Funding Source

NRL 7730022

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• METplus, MET, METdataio, METviewer, METexpress, METcalcpy, METplotpy

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