[docs] [issue32124] Document functions safe to be called before Py_Initialize()

STINNER Victor victor.stinner@gmail.com added the comment:

Then document this explicitly like for other functions that *should* be called before Py_Initialize() if called at all.

I agree that it would be even better to document if a function must not be called after Py_Initialize().

*But* I'm not sure of what I wrote, I have to check the code, and maybe even test manually to "see what happens" (ensure that it works) :-)

So I decided to push my first PR, and will work on a second PR later.

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