Update Virtual Environment tutorial

[ShivnarenSrinivasan]

BPO	45442
Nosy	@miss-islington, @ShivnarenSrinivasan
PRs	bpo-45442: Add deactivate step to venv tutorial. #28959 bpo-45442: Add deactivate step to venv tutorial. #28981

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GitHub fields:

assignee = None
closed_at = <Date 2021-10-16.17:56:04.647>
created_at = <Date 2021-10-12.10:39:52.732>
labels = ['3.8', '3.9', '3.10', '3.11', '3.7', 'docs']
title = 'Update `Virtual Environment` tutorial'
updated_at = <Date 2021-10-16.17:56:04.647>
user = 'https://github.com/ShivnarenSrinivasan'

bugs.python.org fields:

activity = <Date 2021-10-16.17:56:04.647>
actor = 'shivnaren'
assignee = 'docs@python'
closed = True
closed_date = <Date 2021-10-16.17:56:04.647>
closer = 'shivnaren'
components = ['Documentation']
creation = <Date 2021-10-12.10:39:52.732>
creator = 'shivnaren'
dependencies = []
files = []
hgrepos = []
issue_num = 45442
keywords = ['patch']
message_count = 3.0
messages = ['403722', '403724', '404048']
nosy_count = 4.0
nosy_names = ['docs@python', 'python-dev', 'miss-islington', 'shivnaren']
pr_nums = ['28959', '28981']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue45442'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8', 'Python 3.9', 'Python 3.10', 'Python 3.11']

[ShivnarenSrinivasan]

Priority: Low

The Virtual Environment tutorial page (https://docs.python.org/3/tutorial/venv.html) doesn't specify how we can revert, or deactivate the venv.

This is quite a popular question on SO:
https://stackoverflow.com/questions/990754/how-to-leave-exit-deactivate-a-python-virtualenv

deactivate worked for me—this could be added to the docs?

Happy to submit a PR.

[ShivnarenSrinivasan]

In the same vein, the specified script for windows is the old .bat file, though PowerShell is now the preferred shell (and for which a .ps1 script is generated in the venv directory).

We could make the .ps1 the default, and specify the .bat as an alternative?

[miss-islington]

New changeset 11b2ae7 by srinivasan in branch 'main':
bpo-45442: Add deactivate step to venv tutorial. (GH-28981)
11b2ae7