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bpo-36597: fix weakref example code (GH-12779)

Commit 57b1a2862 fixed doctest, but example code is not
match with document.
Just skip doctest for the block.
I
Inada Naoki committed
b3c92c6ae923ffb2b9ac5f80b28ecd689de48662
Parent: 2b00db6
Committed by GitHub <noreply@github.com> on 4/11/2019, 10:05:32 AM