[issue23750] doc: Clarify difference between os.system/subprocess.call in section "Replacing os.system()"

[So Ukiyama]

Change by So Ukiyama <uniocto.streie25r3p05pf at gmail.com>:


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nosy: +uniocto
nosy_count: 4.0 -> 5.0
pull_requests: +24666
pull_request: https://github.com/python/cpython/pull/26016

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