[mmporong]

Thanks for contributing to RTB!

Summary

Docstring fix only: four :param: fields name arguments that the functions do not have.

• RangeBearingSensor.Hx, Hp and Hw document the landmark argument as arg; the parameter is landmark.
• DHRobot.config_validate documents allowable; the parameter is allowables. Its description was the placeholder [description], now "one string of valid characters per choice, default first", which is what the method does (config_validate(config, ("lr", "ud", "nf")) in Puma560).

This does not change numerical results or public behaviour.

Checked with an AST comparison of each :param name against the function signature (the four mismatches are gone) and ruff check / ruff format --check on both files (identical findings before and after, none on the changed lines). pytest, mypy and the Sphinx build were not run, since only docstrings change.

This change was prepared with Claude Code (Claude Opus 5.5).

Related issue

None.

Checklist

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• I checked that no other open PR already addresses this Issue, and commented on the Issue to claim it
• PR title follows Conventional Commits (type: description) — checked automatically, see the "Check PR title" status
• Tests pass locally (pytest)
• Added/updated tests for this change, if applicable
• New/changed code is type-hinted with modern syntax (X | Y, list[X], not Union/Optional/List)
• Docstrings updated (reST style: :param:, :returns:; type hints in the signature cover types now, :type:/:rtype: are rarely needed)
• PR is as small/focused as practical — if it tackles several unrelated things, consider splitting it so each can be reviewed and accepted independently
• I understand that the Codacy check is advisory (it reports assert in tests as "high" security), only All tests passed and the PR title check are required — see CONTRIBUTING
• If this change alters numerical results or public behaviour, I have said so in the summary above, even if it is a bug fix
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• No test files, data files, or notebooks specific to your own project — PyPI has strict package size limits, and RTB is already split into a toolbox and a data package. Notebooks, if of general interest, should have output cleared before committing.

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[codacy-production]

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[petercorke]

Thank you for your first contribution to RTB. Those :param names did not match the signatures, and the [description] placeholder is now a real description. I'm updating your branch from main, and will merge it once the checks pass.