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doc: child_process: clarify `subprocess.pid` can be `undefined` when `ENOENT`

Rodrigo Muino Tomonari requested to merge github/fork/dr-js/doc-subprocess-pid into master

From the code nodejs@8 and up should behave the same: https://github.com/nodejs/node/blame/v8.17.0/lib/internal/child_process.js#L290-L316

And a short test snippet:

const { spawn } = require('child_process')

const subProcess = spawn('non-exist-command')
subProcess.on('error', (error) => console.warn('mute Unhandled "error" event:', error))
console.log('- pid:', subProcess.pid)
process.nextTick(() => console.log('- after error emit'))
console.log('== end of test ==')

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