Rollup merge of #31327 - dirk:dirk/process-child-safety-docs, r=alexcrichton
`Drop` is not 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. r? @steveklabnik
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