Rollup merge of #91610 - aDotInTheVoid:patch-2, r=GuillaumeGomez

Link to rustdoc_json_types docs instead of rustdoc-json RFC

The JSON format has had [many changes](https://github.com/rust-lang/rust/commits/master/src/rustdoc-json-types) since the RFC, so the rustdoc output is the only up to date reference

```@rustdoc``` modify labels: +A-rustdoc-json +A-docs
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Matthias Krüger 2021-12-08 16:08:10 +01:00 committed by GitHub
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@ -396,7 +396,7 @@ Note that the third item is the crate root, which in this case is undocumented.
### `-w`/`--output-format`: output format
`--output-format json` emits documentation in the experimental
[JSON format](https://github.com/rust-lang/rfcs/pull/2963). `--output-format html` has no effect,
[JSON format](https://doc.rust-lang.org/nightly/nightly-rustc/rustdoc_json_types/). `--output-format html` has no effect,
and is also accepted on stable toolchains.
It can also be used with `--show-coverage`. Take a look at its