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

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

Yep, the requirement for supporting multiple interpreters is just that you either avoid relying on C global state entirely, or else correctly synchronise access to it. Multi-phase initialisation just provides a few nudges in the direction of doing that more consistently.

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