[docs] [issue21764] Document that IOBase.__del__ calls self.close

[Roundup Robot]

Roundup Robot added the comment:

New changeset 601a08fcb507 by Benjamin Peterson in branch '3.4':
document IOBase.__del__'s behavior (closes #21764)
http://hg.python.org/cpython/rev/601a08fcb507

New changeset 4dca82f8d91d by Benjamin Peterson in branch '2.7':
document IOBase.__del__'s behavior (closes #21764)
http://hg.python.org/cpython/rev/4dca82f8d91d

New changeset 787cd41d0404 by Benjamin Peterson in branch 'default':
merge 3.4 (#21764)
http://hg.python.org/cpython/rev/787cd41d0404

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nosy: +python-dev
resolution:  -> fixed
stage:  -> resolved
status: open -> closed

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<http://bugs.python.org/issue21764>
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