Add help parameter to arguments#3473
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Adds a
helpparameter toclick.argument()and an Arguments section on--helpwhen argument help is set. Commands without argument help are unchanged.Implementation follows options:
Argument.get_help_record()returns the metavar and help text for the help formatter (the baseParameterclass returnsNone, so arguments never appeared in help tables before).Argument.to_info_dict()now includeshelp, matchingOption, so parameter metadata stays consistent for doc tools; this is not required for CLI help output.Deprecated arguments without explicit
helpshow a deprecation-only row in Arguments, matching deprecated options.fixes #2983