[issue39647] Update doc of init_config.rst

[hai shi]

New submission from hai shi <shihai1991 at 126.com>:

Due to issue36465, the desc of `dump_refs` in init_config.rst should be udpated.

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assignee: docs at python
components: Documentation
messages: 362066
nosy: docs at python, shihai1991, vstinner
priority: normal
severity: normal
status: open
title: Update doc of init_config.rst
versions: Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39647>
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