[docs] [issue9307] Py_TPFLAGS_LONG_SUBCLASS is not documented

Antoine Pitrou pitrou@free.fr added the comment:

It would probably be more useful to document them in the C API and put a reference to that in the inspect module docs. These flags are primarily useful for C extension developers, there's little point checking them from Python code.

---------- nosy: +pitrou versions: +Python 3.1

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