gh-96947: Fix comment on pyruntimestate->pyinterpreters struct for next_id

[vitaldmit]

_next_interp_id appeared on this commit renamed to next_id (by this commit).

Also, now, next_id gets initialized in _PyInterpreterState_Enable()

cpython/Python/pystate.c

Lines 241 to 244 in 12c5f32

	_PyInterpreterState_Enable(_PyRuntimeState *runtime)
	{
	struct pyinterpreters *interpreters = &runtime->interpreters;
	interpreters->next_id = 0;

because _PyInterpreterState_Init() function doesn't exist at all.

• Issue: Fix comment on pyruntimestate->pyinterpreters struct for next_id #96947

Automerge-Triggered-By: GH:ericsnowcurrently

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[vitaldmit]

Ok

[ericsnowcurrently]

LGTM

[ericsnowcurrently]

Thanks for the fix!

[ericsnowcurrently]

FYI, I chose to not backport this. I'm not convinced it matters enough (though it is certainly worth correcting in main).