[docs] [issue34580] sqlite doc: clarify the scope of the context manager

[Berker Peksag]

Change by Berker Peksag <berker.peksag at gmail.com>:


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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
versions:  -Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34580>
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