Make a Webel argument help Rule with a default by convention OR override

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The Doc` function makeArgRuleDef creates a help Rule for an argument with a default with keys compatible for: The 'def$arg' may optionally be overridden with a default for a given usage context.

Please note that at this stage we are only examining use of the Webel '$arg$' help holders conventions in lower-level packages, which rely on "manual" naming conventions; in later slides we'll see how Webel extensions of MTools for OO such as the MArg class can be used to encapsulate the help holders for the Webel arguments convention.

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