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

[Éric Araujo]

Éric Araujo added the comment:

Thanks, LGTM.  Maybe there’s a section about walking files in the os module doc that you could also link to?  Also shutil.

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nosy: +eric.araujo
versions: +Python 3.2 -Python 3.4

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