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

[miss-islington]

miss-islington <mariatta.wijaya+miss-islington at gmail.com> added the comment:


New changeset fc0356d2a34719df517a5056bf1a3709850776cf by Miss Islington (bot) in branch '3.6':
bpo-33629: Prevent coredump in test_importlib (GH-7090)
https://github.com/python/cpython/commit/fc0356d2a34719df517a5056bf1a3709850776cf


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<https://bugs.python.org/issue32374>
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