[docs] [issue29893] create_subprocess_exec doc doesn't match software

[STINNER Victor]

STINNER Victor added the comment:

Ah, I wrote "def create_subprocess_exec(program, *args," to implicitly check that args is non empty.

We can either change the function prototype to check that args is non-empty in the body, or just update the documentation.

The documentation is not exactly wrong :-)

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nosy: +haypo

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