[issue23511] Broken code example in email module documentation

[Baptiste Mispelon]

Baptiste Mispelon added the comment:

I wasn't sure if that was going to be out of scope or not.

Here's an attached patch that fixes the remaining usages of `open` inside `Doc/includes` to always use a context manager.

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Added file: http://bugs.python.org/file38233/issue23511_open_cm.diff

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