[docs] [issue23986] Inaccuracy about "in" keyword for list and tuple

[Roundup Robot]

Roundup Robot added the comment:

New changeset aba647a34ed4 by Raymond Hettinger in branch '2.7':
Issue #23986:  Note that the in-operator for lists and tuples check identity before equality.
https://hg.python.org/cpython/rev/aba647a34ed4

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nosy: +python-dev

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