[docs] [issue13424] Add examples for open’s new opener argument

[Éric Araujo]

Éric Araujo added the comment:

Thanks for all comments.  If you think of a better example to show the usage of the argument, feel free to change it.

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assignee: docs at python -> eric.araujo
resolution:  -> fixed
stage: commit review -> committed/rejected
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13424>
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