[docs] [issue32923] Typo in documentation of unittest: whilst instead of while

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

> lets change it to make it more approachable to non-native speakers.

Sounds good to me.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32923>
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