[docs] [issue28383] __hash__ documentation recommends naive XOR to combine but this is suboptimal

[Roundup Robot]

Roundup Robot added the comment:

New changeset fac2362f248c by Victor Stinner in branch '2.7':
doc: Suggest to hash(tuple of attr) rather than XOR
https://hg.python.org/cpython/rev/fac2362f248c

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<http://bugs.python.org/issue28383>
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