[docs] [issue32374] Document that m_traverse for multi-phase initialized modules can be called with m_state=NULL

[Antoine Pitrou]

Change by Antoine Pitrou <pitrou at free.fr>:


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assignee:  -> docs at python
components: +Documentation
nosy: +docs at python
type:  -> behavior

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32374>
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