docs: fix broken URL

[fabaff]

Thanks for contributing to RTB!

Summary

Related issue

Checklist

Only the first item below is checked automatically — the rest are a self-check for you before requesting review, nothing currently verifies them for you.

• 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
• 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.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (0c5be6d) to head (4879aaf).

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #657   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files        143     143           
  Lines      14050   14050           
=====================================
  Misses     14050   14050           

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[petercorke]

Thanks for your interest in the Toolbox. Great catch, this link has been wrong since this file was written. Appreciate the input.