bpo-28617 Fixed docs inaccuracies about the types that support membership tests (GH-9086)

<!-- issue-number: [bpo-28617](https://www.bugs.python.org/issue28617) -->
https://bugs.python.org/issue28617
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wim glenn committed 7y ago

08bcf647d8a92e4bd47531588b284c6820b7a7ef

Parent: b690b9b

Committed by Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> on 9/11/2018, 5:44:52 PM