[docs] [issue12670] Fix struct code after forward declaration on ctypes doc

[Sandro Tosi]

Changes by Sandro Tosi <sandro.tosi at gmail.com>:


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resolution:  -> fixed
stage: patch review -> committed/rejected
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12670>
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