[docs] typo in subprocess doc

[Anthon van der Neut]

In the subprocess documentation there is an 'r' missing in the  header 
for the Popen constructor


      17.1.1.2. Popen Constuctor¶
      <http://docs.python.org/library/subprocess.html#popen-constuctor>

Popen Constuctor
^^^^^^^^^^^^^^^^

should be

Popen Constructor
^^^^^^^^^^^^^^^^^


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