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

[Marcel Plch]

Marcel Plch <gmarcel.plch at gmail.com> added the comment:

I have created a PR at https://github.com/python/cpython/pull/5140
It contains documentation, plus, in --with-pydebug mode, it calls m_traverse to catch easy cases of not handling the m_state==NULL case early.

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