Accessibility of Splitter.remaining

Hi,

Scala parallel collections [docs](https://docs.scala-lang.org/overviews/parallel-collections/custom-parallel-collections.html#further-customizations-concurrent-and-other-collections) and [MOOC](https://www.coursera.org/learn/scala-parallel-programming) mention a `.remaining` method  on `Splitter` and a `.splitter` method on collections returning a `Splitter`: https://github.com/scala/scala-parallel-collections/blob/7bc6f6ee2942226bc5376eb80380e102c5a4c937/core/src/main/scala/scala/collection/parallel/ParIterableLike.scala#L48-L58

In practice, `.remaining` is actually defined on `IterableSplitter`: https://github.com/scala/scala-parallel-collections/blob/7bc6f6ee2942226bc5376eb80380e102c5a4c937/core/src/main/scala/scala/collection/parallel/RemainsIterator.scala#L366

And the `.splitter` method is package-private: https://github.com/scala/scala-parallel-collections/blob/7bc6f6ee2942226bc5376eb80380e102c5a4c937/core/src/main/scala/scala/collection/parallel/ParIterableLike.scala#L233

Why is that?

Is there a way to obtain an `IterableSplitter` from a collection using the public API?

In particular, a slide of the MOOC suggests this implementation of `.fold` on a `Splitter`:

<img width="713" alt="image" src="https://user-images.githubusercontent.com/777748/165130315-8ed1111d-a85f-4cae-8f84-f25b5b0a3aa5.png">

How could I use it in practice, say on a `ParVector`?

	* All of the parallel operations are implemented as tasks within this trait. Tasks rely
	* on the concept of splitters, which extend iterators. Every parallel collection defines:
	*
	* {{{
	* def splitter: IterableSplitter[T]
	* }}}
	*
	* which returns an instance of `IterableSplitter[T]`, which is a subtype of `Splitter[T]`.
	* Splitters have a method `remaining` to check the remaining number of elements,
	* and method `split` which is defined by splitters. Method `split` divides the splitters
	* iterate over into disjunct subsets:

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