Docs for importlib.metadata should mention Python version

[pitrou]

BPO	43856
Nosy	@jaraco, @pitrou, @ezio-melotti, @merwok, @methane, @willingc, @JulienPalard, @ZackerySpytz, @miss-islington, @shreyanavigyan
PRs	bpo-43856: Add a versionadded directive to the importlib.metadata docs #25445 bpo-43856: Indicate the version in which importlib.metadata was introduced. #25448 [3.9] bpo-43856: Add a versionadded directive to the importlib.metadata docs (GH-25445) #25494 [3.8] bpo-43856: Add a versionadded directive to the importlib.metadata docs (GH-25445) #25495

^{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/jaraco'
closed_at = <Date 2021-04-23.13:21:37.807>
created_at = <Date 2021-04-15.15:54:10.581>
labels = ['3.8', 'type-bug', 'library', '3.9', '3.10']
title = 'Docs for importlib.metadata should mention Python version'
updated_at = <Date 2021-04-23.13:21:37.806>
user = 'https://github.com/pitrou'

bugs.python.org fields:

activity = <Date 2021-04-23.13:21:37.806>
actor = 'jaraco'
assignee = 'jaraco'
closed = True
closed_date = <Date 2021-04-23.13:21:37.807>
closer = 'jaraco'
components = ['Library (Lib)']
creation = <Date 2021-04-15.15:54:10.581>
creator = 'pitrou'
dependencies = []
files = []
hgrepos = []
issue_num = 43856
keywords = ['patch']
message_count = 5.0
messages = ['391139', '391143', '391263', '391661', '391662']
nosy_count = 10.0
nosy_names = ['jaraco', 'pitrou', 'ezio.melotti', 'eric.araujo', 'methane', 'willingc', 'mdk', 'ZackerySpytz', 'miss-islington', 'shreyanavigyan']
pr_nums = ['25445', '25448', '25494', '25495']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue43856'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']

[pitrou]

https://docs.python.org/3/library/importlib.metadata.html lacks a mention of which Python version saw the introduction of importlib.metadata (it definitely doesn't exist in my 3.7 install, for example).

[shreyanavigyan]

importlib.metadata was introduced in Python 3.8. But you're right the docs should mention about the version importlib.metadata was introduced in.

[miss-islington]

New changeset adf24bd by Zackery Spytz in branch 'master':
bpo-43856: Add a versionadded directive to the importlib.metadata docs (GH-25445)
adf24bd