[docs] [issue14616] subprocess docs should mention pipes.quote/shlex.quote

[Chris Rebert]

Chris Rebert added the comment:

Just to keep the ball rolling, in case it ends up being the solution ultimately chosen, here is a patch against 2.7 to document pipes.quote(). The text is yanked straight from shlex.quote(), the differences being:
- qualify shlex.split() references
- print function -> print statement
- add deprecation note (currently backdated to when `pipes` was added to the std lib; mentions what happens in 3.3)

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versions: +Python 3.4, Python 3.5
Added file: http://bugs.python.org/file27761/pipes.rst.diff

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<http://bugs.python.org/issue14616>
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