* Improve clarity of precedence when command-line parameters are used.
* Add command-line values into the precedence list.
* Several sample config snippets were included without any explanation
of how those snippets would be processed. Added descriptions so that
the reader can understand what each snippet will (or won't) accomplish.
* Don't focus on inventory as much
Expand on the fact that it's the fact that a variable is set that
matters, not the source of the variable.
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