Update devguide link to the new URL

Mariatta

BPO	30737
Nosy	@JulienPalard, @Mariatta
PRs	bpo-30737: Update link to the Devguide #3228 [3.6] bpo-30737: Update DevGuide links to new URL (GH-3228) #3390

^{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 = 'https://github.com/Mariatta'
closed_at = <Date 2017-09-06.21:29:45.747>
created_at = <Date 2017-06-22.17:05:47.316>
labels = ['3.7', 'docs']
title = 'Update devguide link to the new URL'
updated_at = <Date 2017-12-09.21:51:11.122>
user = 'https://github.com/Mariatta'

bugs.python.org fields:

activity = <Date 2017-12-09.21:51:11.122>
actor = 'mdk'
assignee = 'Mariatta'
closed = True
closed_date = <Date 2017-09-06.21:29:45.747>
closer = 'Mariatta'
components = ['Documentation']
creation = <Date 2017-06-22.17:05:47.316>
creator = 'Mariatta'
dependencies = []
files = []
hgrepos = []
issue_num = 30737
keywords = []
message_count = 7.0
messages = ['296644', '296645', '301030', '301523', '307919', '307921', '307923']
nosy_count = 2.0
nosy_names = ['mdk', 'Mariatta']
pr_nums = ['3228', '3390']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue30737'
versions = ['Python 3.6', 'Python 3.7']