[docs] [issue33862] doc Fix Enum __members__ type

New submission from Andrés Delfino <adelfino@gmail.com>: Documentation says __members__ attribute returns an "ordered dictionary" but it returns a mappingproxy instead. PR fixes this. ---------- assignee: docs@python components: Documentation messages: 319532 nosy: adelfino, docs@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 _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue33862> _______________________________________