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

[INADA Naoki]

Change by INADA Naoki <songofacandy at gmail.com>:


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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
versions: +Python 3.6, Python 3.8

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