[docs] [issue34379] Move note about repeated calls to json.dump using the same fp to the json.dump section

[Evan Allrich]

Change by Evan Allrich <psf at allri.ch>:


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keywords: +patch
pull_requests: +8215
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34379>
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