bpo-45799: [Doc] improve confusing sentence in __main__.rst (GH-29546)

I was reading this bit last night and thought it was a typo. In the light of day, I realized it wasn't *technically* a typo, but definitely confusing wording. This PR fixes the confusing sentence.

Automerge-Triggered-By: GH:ericvsmith
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Jack DeVries 2021-11-13 15:16:05 -05:00 committed by GitHub
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@ -116,8 +116,8 @@ Idiomatic Usage
^^^^^^^^^^^^^^^
Some modules contain code that is intended for script use only, like parsing
command-line arguments or fetching data from standard input. When a module
like this were to be imported from a different module, for example to unit test
command-line arguments or fetching data from standard input. If a module
like this was imported from a different module, for example to unit test
it, the script code would unintentionally execute as well.
This is where using the ``if __name__ == '__main__'`` code block comes in