Update curses docs to Python 3

BPO	30872
Nosy	@Yhg1s, @bitdancer, @serhiy-storchaka
PRs	bpo-30872: Update the curses docs to Python 3. #2620 [3.6] bpo-30872: Update the curses docs to Python 3. (GH-2620) #3887

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2017-10-05.07:27:48.653>
created_at = <Date 2017-07-07.15:14:13.715>
labels = ['type-feature', '3.7', 'docs']
title = 'Update curses docs to Python 3'
updated_at = <Date 2017-10-05.07:27:48.652>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2017-10-05.07:27:48.652>
actor = 'serhiy.storchaka'
assignee = 'docs@python'
closed = True
closed_date = <Date 2017-10-05.07:27:48.653>
closer = 'serhiy.storchaka'
components = ['Documentation']
creation = <Date 2017-07-07.15:14:13.715>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 30872
keywords = ['patch']
message_count = 3.0
messages = ['297892', '303730', '303741']
nosy_count = 4.0
nosy_names = ['twouters', 'r.david.murray', 'docs@python', 'serhiy.storchaka']
pr_nums = ['2620', '3887']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue30872'
versions = ['Python 3.6', 'Python 3.7']