[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 1da0479f687613a43620430616f4db87e2ed4423 by Miss Islington (bot) in branch '3.6':
bpo-32374:  m_traverse may be called with m_state=NULL (GH-5140)
https://github.com/python/cpython/commit/1da0479f687613a43620430616f4db87e2ed4423


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