[docs] [issue11985] Document that platform.python_implementation supports PyPy

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset affec521b330 by Ezio Melotti in branch '2.7':
#11985: update docstring of platform.python_implementation.
http://hg.python.org/cpython/rev/affec521b330

New changeset 7bf9d7ae6c94 by Ezio Melotti in branch '3.1':
#11985: update docstring of platform.python_implementation.
http://hg.python.org/cpython/rev/7bf9d7ae6c94

New changeset cc7342b4e59d by Ezio Melotti in branch '3.2':
#11985: merge with 3.1.
http://hg.python.org/cpython/rev/cc7342b4e59d

New changeset 6b95bf39842f by Ezio Melotti in branch 'default':
#11985: merge with 3.2.
http://hg.python.org/cpython/rev/6b95bf39842f

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<http://bugs.python.org/issue11985>
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