Compute the right output filenames for rustdoc invocations that request the JSON format#12100

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LukeMathWalker wants to merge 3 commits intorust-lang:masterfrom

LukeMathWalker:json-freshness

Commits on May 7, 2023

Modify `cargo` to correctly determine the output file path for a doc compilation unit when `cargo rustdoc` has been instructed to generate JSON output rather than the conventional HTML output.
LukeMathWalker
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Add a test.
LukeMathWalker
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Rustfmt
LukeMathWalker
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