[docs] [issue28785] Clarify the behavior of NotImplemented

[Martin Panter]

Martin Panter added the comment:

Correct, I meant to say the first fallback is the other call.

BTW your suggested text might hold for __eq__(), but for __ne__(), returning NotImplemented seems to bypass the “not a.__eq__(b)” fallback.

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<http://bugs.python.org/issue28785>
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