Mention Pillow package on tkinter.rst to work with more image formats

BPO	33297
Nosy	@terryjreedy, @serhiy-storchaka, @andresdelfino, @miss-islington
PRs	bpo-33297: Mention Pillow to work with more image formats #6505 [3.7] bpo-33297: Mention Pillow to work with more image formats. (GH-6505) #6560 [3.6] bpo-33297: Mention Pillow to work with more image formats. (GH-6505) #6561 [2.7] bpo-33297: Mention Pillow to work with more image formats. (GH-6505) #6562

^{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 2018-04-21.16:08:06.099>
created_at = <Date 2018-04-17.11:12:06.014>
labels = ['type-feature', '3.8', 'docs']
title = 'Mention Pillow package on tkinter.rst to work with more image formats'
updated_at = <Date 2018-04-21.16:08:06.098>
user = 'https://github.com/andresdelfino'

bugs.python.org fields:

activity = <Date 2018-04-21.16:08:06.098>
actor = 'serhiy.storchaka'
assignee = 'docs@python'
closed = True
closed_date = <Date 2018-04-21.16:08:06.099>
closer = 'serhiy.storchaka'
components = ['Documentation']
creation = <Date 2018-04-17.11:12:06.014>
creator = 'adelfino'
dependencies = []
files = []
hgrepos = []
issue_num = 33297
keywords = ['patch']
message_count = 6.0
messages = ['315393', '315564', '315565', '315566', '315567', '315572']
nosy_count = 5.0
nosy_names = ['terry.reedy', 'docs@python', 'serhiy.storchaka', 'adelfino', 'miss-islington']
pr_nums = ['6505', '6560', '6561', '6562']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue33297'
versions = ['Python 3.8']