Fix #20345 - Params section in ddoc comments causes warnings with unn…

[dkorpel]

…amed parameters

Closes #20345

[dlang-bot]

Thanks for your pull request and interest in making D better, @dkorpel! We are looking forward to reviewing it, and you should be hearing from a maintainer soon.
Please verify that your PR follows this checklist:

• My PR is fully covered with tests (you can see the coverage diff by visiting the details link of the codecov check)
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• I have provided a detailed rationale explaining my changes
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dub run digger -- build "master + dmd#23050"