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Rollup merge of #91310 - hi-rustin:rustin-patch-rustdoc, r=jyn514

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Add --out-dir flag for rustdoc

part of https://github.com/rust-lang/rust/issues/91260

Add --out-dir flag for rustdoc and change the `-o` option to point to out-dir.

I'm not quite sure if it should be stable, also I'm not sure if this parameter priority is appropriate? Or should I just refuse to pass both parameters at the same time?

r? `@jyn514`
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Matthias Krüger 2021-12-11 08:22:30 +01:00 • committed by GitHub
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src/doc/rustdoc/src/command-line-arguments.md
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@ -57,13 +57,13 @@ release: 1.17.0
LLVM version: 3.9
```
## `-o`/`--output`: output path
## `-o`/`--out-dir`: output directory path
Using this flag looks like this:
```bash
$ rustdoc src/lib.rs -o target/doc
$ rustdoc src/lib.rs --output target/doc
$ rustdoc src/lib.rs --out-dir target/doc
```
By default, `rustdoc`'s output appears in a directory named `doc` in