[docs] [issue26829] update docs: when creating classes a new dict is created for the final class object

[Ethan Furman]

New submission from Ethan Furman:

https://docs.python.org/3/reference/datamodel.html#creating-the-class-object

This section should mention that the final class is created with a new dict(), and all key/value pairs from the dict used during creation are copied over.

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assignee: docs at python
components: Documentation
messages: 264016
nosy: docs at python, ethan.furman
priority: normal
severity: normal
status: open
title: update docs: when creating classes a new dict is created for the final class object
versions: Python 3.4, Python 3.5, Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26829>
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