[docs] [issue15789] mention shell-like parts of the std lib in the subprocess docs

[Chris Jerdonek]

Chris Jerdonek added the comment:

This is a nit, but can you adhere to an 80-character line length?  Much (but not all) of the documentation does.

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nosy: +cjerdonek

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<http://bugs.python.org/issue15789>
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