[docs] [issue10461] Use with statement throughout the docs

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset cebaf1bdaf78 by Éric Araujo in branch 'default':
Fix example in atexit doc: Both open and read could raise the IOError (#10461 follow-up).
http://hg.python.org/cpython/rev/cebaf1bdaf78

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status: pending -> open

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10461>
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