[docs] [issue35168] shlex punctuation_chars inconsistency

[Roundup Robot]

Change by Roundup Robot <devnull at psf.upfronthosting.co.za>:


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keywords: +patch, patch, patch
pull_requests: +11400, 11401, 11402
stage: needs patch -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35168>
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