Safety docs about `std::process::Child` going out of scope

There is no `Drop` implemented for `Child`, so if it goes out
of scope in Rust-land and gets deallocated, the child process
will continue to exist and execute. If users want a guarantee
that the process has finished running and exited they must
manually use `kill`, `wait`, or `wait_with_output`.

Fixes #31289.

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