Fix broken ddoc

[wilzbach]

Follow-up to #5523 (let's automate this)

dlang.org PR (for the automated check): dlang/dlang.org#1782

[dlang-bot]

Thanks for your pull request, @wilzbach! We are looking forward to reviewing it, and you should be hearing from a maintainer soon.

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• smaller, focused PRs are easier to review than big ones

• try not to mix up refactoring or style changes with bug fixes or feature enhancements

• provide helpful commit messages explaining the rationale behind each change

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[wilzbach]

(also contains the HTTP fix from #5516 as this is detected by the new check as well)

[quickfur]

LGTM