Link to cargo's build-std feature instead of xargo in custom target docs

The `xargo` tool is in maintenance mode since 2018 and the `build-std` feature of cargo already works reasonably well for most use cases.
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Philipp Oppermann 2020-10-24 14:30:45 +02:00 committed by GitHub
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@ -14,4 +14,4 @@ To see it for a different target, add the `--target` flag:
$ rustc +nightly -Z unstable-options --target=wasm32-unknown-unknown --print target-spec-json
```
To use a custom target, see [`xargo`](https://github.com/japaric/xargo).
To use a custom target, see the (unstable) [`build-std` feature](https://doc.rust-lang.org/nightly/cargo/reference/unstable.html) of `cargo`.