[docs] [issue33470] Changes from GH-1638 (GH-3575, bpo-28411) are not documented in Porting to Python 3.7

[Eric Snow]

Eric Snow <ericsnowcurrently at gmail.com> added the comment:

Under Py_LIMITED_API:

    typedef struct _is PyInterpreterState;

Also, the actual removal of the "modules" field was reverted.  The field is still there until I get back to fixing https://github.com/python/cpython/pull/3606.

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