[docs] [issue15204] Deprecate the 'U' open mode

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


Removed file: http://bugs.python.org/file26197/deprecate-U-mode-stage1.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15204>
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