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

[Karthikeyan Singaravelan]

Karthikeyan Singaravelan <tir.karthi at gmail.com> added the comment:

Thanks, I have pushed a change adding `con.close` at the end of the example and also verified that `./python.exe Doc/includes/sqlite3/ctx_manager.py` works as expected.

Thanks

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