Issue #12196: Add a note on os.pipe2() in the "Whats' new in Python 3.3" document.
Issue #12196: Add a note on os.pipe2() in the "Whats' new in Python 3.3"
document.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator