Capsule API usage docs are incompatible with module reloading (etc)

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2017-12-31.05:27:01.669>
labels = ['type-bug']
title = 'Capsule API usage docs are incompatible with module reloading (etc)'
updated_at = <Date 2018-01-09.10:25:18.773>
user = 'https://github.com/ncoghlan'

bugs.python.org fields:

activity = <Date 2018-01-09.10:25:18.773>
actor = 'petr.viktorin'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = []
creation = <Date 2017-12-31.05:27:01.669>
creator = 'ncoghlan'
dependencies = []
files = []
hgrepos = []
issue_num = 32459
keywords = []
message_count = 1.0
messages = ['309266']
nosy_count = 5.0
nosy_names = ['brett.cannon', 'ncoghlan', 'petr.viktorin', 'eric.snow', 'Dormouse759']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'needs patch'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue32459'
versions = []