Reduce use of old-style syntax in typing docs

[AlexWaygood]

BPO	46104
Nosy	@gvanrossum, @miss-islington, @Fidget-Spinner, @AlexWaygood
PRs	bpo-46104: Reduce use of pre-PEP 526 syntax in typing docs #30148 [3.10] bpo-46104: Reduce use of pre-PEP 526 syntax in typing docs (GH-30148) #30179 [3.9] bpo-46104: Reduce use of pre-PEP 526 syntax in typing docs (GH-30148) #30180 bpo-46104: [typing docs]: Fix example broken by PR #30148 #30203 [3.10] bpo-46104: Fix example broken by GH-30148 (GH-30203) #30209 [3.9] bpo-46104: Fix example broken by GH-30148 (GH-30203) #30210

^{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 2021-12-20.06:03:43.530>
created_at = <Date 2021-12-16.16:23:54.674>
labels = ['3.11', 'type-feature', '3.9', '3.10', 'docs']
title = 'Reduce use of old-style syntax in typing docs'
updated_at = <Date 2021-12-20.06:03:43.529>
user = 'https://github.com/AlexWaygood'

bugs.python.org fields:

activity = <Date 2021-12-20.06:03:43.529>
actor = 'AlexWaygood'
assignee = 'docs@python'
closed = True
closed_date = <Date 2021-12-20.06:03:43.530>
closer = 'AlexWaygood'
components = ['Documentation']
creation = <Date 2021-12-16.16:23:54.674>
creator = 'AlexWaygood'
dependencies = []
files = []
hgrepos = []
issue_num = 46104
keywords = ['patch']
message_count = 7.0
messages = ['408721', '408840', '408842', '408843', '408943', '408945', '408946']
nosy_count = 5.0
nosy_names = ['gvanrossum', 'docs@python', 'miss-islington', 'kj', 'AlexWaygood']
pr_nums = ['30148', '30179', '30180', '30203', '30209', '30210']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue46104'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']

[AlexWaygood]

There are a few places in the typing docs where old-style (pre-PEP 526) syntax is used in examples. It doesn't look like these examples have been updated since 2016; it would be good to change them so that they use the newer syntax introduced in PEP-526.

[Fidget-Spinner]

New changeset 6ada013 by Alex Waygood in branch 'main':
bpo-46104: Reduce use of pre-PEP 526 syntax in typing docs (GH-30148)
6ada013

[miss-islington]

New changeset 43cb8f4 by Miss Islington (bot) in branch '3.9':
[3.9] bpo-46104: Reduce use of pre-PEP 526 syntax in typing docs (GH-30148) (GH-30180)
43cb8f4

[miss-islington]

New changeset a66be91 by Miss Islington (bot) in branch '3.10':
[3.10] bpo-46104: Reduce use of pre-PEP 526 syntax in typing docs (GH-30148) (GH-30179)
a66be91

[Fidget-Spinner]

New changeset 7c5c3f7 by Alex Waygood in branch 'main':
bpo-46104: Fix example broken by #74334 (GH-30203)
7c5c3f7

[miss-islington]

New changeset 8e4564d by Miss Islington (bot) in branch '3.9':
[3.9] bpo-46104: Fix example broken by #74334 (GH-30203) (GH-30210)
8e4564d

[miss-islington]

New changeset 0c0bd78 by Miss Islington (bot) in branch '3.10':
[3.10] bpo-46104: Fix example broken by #74334 (GH-30203) (GH-30209)
0c0bd78