Rollup merge of #133711 - cod10129:master, r=Noratrieb

add isatty doc alias for `is_terminal`

(first Rust contribution!)

This adds `isatty` as a doc alias for [`std::io::IsTerminal::is_terminal`](https://doc.rust-lang.org/stable/std/io/trait.IsTerminal.html#tymethod.is_terminal).

I think this change does meet the [doc alias policy](https://std-dev-guide.rust-lang.org/policy/doc-alias.html). This would be especially useful because searching "rust isatty" gets you the `isatty` crate which is deprecated in favor of `atty`. `atty` is unmaintained and you might get to `is-terminal`, which will finally tell you that the function you're looking for has been in `std` all along.

The Windows implementation of `is_terminal()` doesn't use `isatty`, but that hasn't been a problem for the analogous cases of `create_dir()`'s alias `mkdir` or `remove_dir()`/`rmdir`.

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