[issue17894] Edits to descriptor howto

[Raymond Hettinger]

Raymond Hettinger added the comment:

Please don't go crazy with this.  I will look at the suggestions and make some edits to improve its readability but am not going to change it into a breezy conversational style.  Instead, I'll likely put together a separate descriptor tutorial that presents an easier on-ramp (in contrast to an authoritative document closely tied to the actually implementation details).

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<http://bugs.python.org/issue17894>
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