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

[Ezio Melotti]

Ezio Melotti added the comment:

> I think patch for 3.3 should mention only shlex.quote.

+1

I'm not sure what's the best thing to do about pipes.quote.  Pointing to an undocumented function that is available in 3.3 in a different module doesn't sound like a really good idea.
Maybe we could document pipes.quote as an internal/deprecated function so that people that follow the link from the subprocess docs will be aware that the function is available under a different name in 3.3+.
Otherwise we could just document shlex.quote() in 3.3+.

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nosy: +ezio.melotti

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