[docs] [issue30449] Improve __slots__ datamodel documentation

[Raymond Hettinger]

Raymond Hettinger added the comment:


New changeset 2b44e302ec3079363c4d5c875677945953705c58 by Raymond Hettinger (Aaron Hall, MBA) in branch 'master':
bpo-30449 Terse slots (#1819)
https://github.com/python/cpython/commit/2b44e302ec3079363c4d5c875677945953705c58


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