[docs] [issue30449] Improve __slots__ datamodel documentation

[Aaron Hall]

Aaron Hall added the comment:

I've been working on this section quite a lot, trying to improve the flow of content (which in the prior revision is a bit of a mish-mash of information in the "Notes on using __slots__ section") - I intend to move some of that information into the exposition/introduction.

I have also been reviewing my changes and actively working on it with a volunteer at the PyCon sprints, Joshua Goldin. Will submit a pull request soon, tonight or tomorrow morning.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30449>
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