[docs] [issue28677] difficult to parse sentence structure in "When an instance attribute is referenced that isn't a data attribute"

[Cheryl Sabella]

Change by Cheryl Sabella <chekat2 at gmail.com>:


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keywords: +easy
stage:  -> needs patch
versions: +Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue28677>
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