Improve documentation of run(Cmd) #57705
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This PR aims to make it clearer to new users how
run,wait, andProcess::exitcodeallinteract. This is a comment point of confusion for new users.
It's a bit awkward having
Processbe a sort-of-internal data type, but then expectingusers to use
Process::exitcode. I think this PR at least makes the current situationclearer, and design changes can be left alone for now.
Fix #57612.