[docs] [issue30449] Improve __slots__ datamodel documentation

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

mpb, I think the docs with respect to strings are fine as-is.  Sometimes if too much detail is put in, it makes the docs harder to read and understand (i.e. it gets in the way of our primary purpose).

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<https://bugs.python.org/issue30449>
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