[issue6760] patch to subprocess docs to better explain Popen's 'args' argument

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

The change to echo is an excellent improvement.  You forgot to change 'python' to 'echo' in the following paragraph, though. You are also correct about /bin/sh vs sh, my bad.  And I was even looking at the source code when I wrote that...

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<http://bugs.python.org/issue6760>
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