[issue25866] Reference 3. Data Model: miscellaneous minor cleanups on the word "sequence".

[Andrei Daraschenka]

Change by Andrei Daraschenka <dorosch.github.io at yandex.ru>:


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pull_requests: +16683
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/17175

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