Make a Webel help Rule for a required ‘$arg$’ argument + conventions

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The Doc` function makeArgRuleReq creates a help Rule for a required argument with keys compatible for:

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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