Rollup merge of #84709 - joshtriplett:doc-alias-chdir, r=dtolnay

Add doc alias for `chdir` to `std::env::set_current_dir`

Searching for `chdir` in the Rust documentation produces no useful
results.

I wrote some code recently that called `libc::chdir` and manually
handled errors, because I didn't realize that the safe
`std::env::set_current_dir` existed. I searched for `chdir` and
`change_dir` and `change_directory` (the latter two based on the
precedent of unabbreviating set by `create_dir`), and I also read
through `std::fs` expecting to potentially find it there. Given that
none of those led to `std::env::set_current_dir`, I think that provides
sufficient justification to add this specific alias.

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