'$doc$arg$'

A (typically generated) argument documentation String helper for use in combination with the low-level Webel Doc` package for Wolfram Language ::usage help generation.
Webel: Mathematica: CONVENTION: A '$doc$' prefix indicates a formatted documentation String helper. A '$doc$arg$' is for an argument, a '$doc$opt$' is for an option. A '$doc$ String may be used to create ::usage documentation via docF.
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