[issue37913] Document that __length_hint__ may return NotImplemented

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:


New changeset 009ef2955d91e04f62a7159a1c7ddaddbfedc3b6 by Steve Dower (Jeroen Demeyer) in branch 'master':
bpo-37913: document that __length_hint__ can return NotImplemented (GH-15383)
https://github.com/python/cpython/commit/009ef2955d91e04f62a7159a1c7ddaddbfedc3b6


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nosy: +steve.dower

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