[issue13587] Correcting the typos error in Doc/howto/urllib2.rst

[Terry J. Reedy]

Changes by Terry J. Reedy <tjreedy at udel.edu>:


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versions:  -Python 2.6, Python 3.1, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13587>
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