[issue38558] Data Structures documentation out of sync with new Walrus operator

[Adorilson Bezerra]

Change by Adorilson Bezerra <adorilson at gmail.com>:


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pull_requests: +17458
pull_request: https://github.com/python/cpython/pull/16973

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38558>
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