[doc] ctypes is too slow to convert a Python list to a C array

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2016-09-01.09:31:15.237>
labels = ['ctypes', '3.8', '3.9', '3.10', 'performance']
title = 'ctypes is too slow to convert a Python list to a C array'
updated_at = <Date 2021-03-05.19:07:48.471>
user = 'https://bugs.python.org/TomCornebize'

bugs.python.org fields:

activity = <Date 2021-03-05.19:07:48.471>
actor = 'eryksun'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['ctypes']
creation = <Date 2016-09-01.09:31:15.237>
creator = 'Tom Cornebize'
dependencies = []
files = ['44320']
hgrepos = []
issue_num = 27926
keywords = []
message_count = 3.0
messages = ['274111', '274138', '274148']
nosy_count = 2.0
nosy_names = ['eryksun', 'Tom Cornebize']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'performance'
url = 'https://bugs.python.org/issue27926'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']