[issue33862] doc Fix Enum __members__ type

[Andrés Delfino]

New submission from Andrés Delfino <adelfino at gmail.com>:

Documentation says __members__ attribute returns an "ordered dictionary" but it returns a mappingproxy instead.

PR fixes this.

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assignee: docs at python
components: Documentation
messages: 319532
nosy: adelfino, docs at python
priority: normal
severity: normal
status: open
title: doc Fix Enum __members__ type
type: enhancement
versions: Python 3.6, Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33862>
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