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

Eric Snow ericsnowcurrently@gmail.com added the comment:

I've left a review (writing it as you merged the PR).

My main concern is that we not promise more than we must. Every pre-init function or variable we promise to embedders represents global state that is hard to get rid of. It also entrenches pre-init API and state that we're aiming to deprecate (via PEP 432).

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