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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 17b094c08600 by Éric Araujo in branch '3.3':
Add examples for opener argument of open (#13424).
http://hg.python.org/cpython/rev/17b094c08600

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nosy: +python-dev

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