Update references to PIL-style arrays

BPO 33310
Nosy @pitrou, @skrah, @serhiy-storchaka

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 2018-04-18.19:08:33.914>
created_at = <Date 2018-04-18.18:38:33.626>
labels = ['3.8', 'type-feature', '3.7', 'invalid', 'docs']
title = 'Update references to PIL-style arrays'
updated_at = <Date 2018-04-18.19:17:00.311>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2018-04-18.19:17:00.311>
actor = 'serhiy.storchaka'
assignee = 'docs@python'
closed = True
closed_date = <Date 2018-04-18.19:08:33.914>
closer = 'skrah'
components = ['Documentation']
creation = <Date 2018-04-18.18:38:33.626>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 33310
keywords = []
message_count = 5.0
messages = ['315458', '315460', '315461', '315462', '315463']
nosy_count = 4.0
nosy_names = ['pitrou', 'skrah', 'docs@python', 'serhiy.storchaka']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue33310'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']