Many references to unsupported Python versions in the stdlib docs

[AlexWaygood]

Documentation

There are currently many places in the stdlib docs where there are needless comments about how to maintain compatibility with Python versions that are now end-of-life. Many of these can now be removed, to improve brevity and clarity in the documentation.

I plan to submit a number of PRs to fix these.

PRs:

• gh-92417: typing docs: from __future__ import annotations can be used in all supported Python versions #92418
• gh-92417: asyncio docs: asyncio.run() is available on all supported Python versions #92419
• gh-92417: doctest docs: remove references to Python <3.6 #92420
• gh-92417: fractions, decimal: Improve docs for alternative constructor methods #92421
• gh-92417: json docs: dict is ordered on all supported Python versions #92422
• gh-92417: stdtypes docs: delete discussion of Python 2 differences #92423
• gh-92417: importlib docs: remove references to unsupported Python versions #92424
• gh-92417: logging docs: Remove warning that only applies to Python <3.2 #92425
• gh-92417: Update docs and examples of doctest.IGNORE_EXCEPTION_DETAIL for Py>=3 #92502
• gh-92417: subprocess docs: remove note on compatibility with Python <3.5 #92538
• gh-92417: unittest.mock docs: remove references to Python <2.6 #92539
• gh-92417: zlib docs, binascii docs: remove Python 2 compatibility notes #92543
• gh-92417: socket docs: remove references to Python <3.3 #92544
• [More to come]

Backports:

• [3.11] gh-92417: typing docs: from __future__ import annotations can be used in all supported Python versions (GH-92418) #92459
• [3.10] gh-92417: typing docs: from __future__ import annotations can be used in all supported Python versions (GH-92418) #92460
• [3.9] gh-92417: typing docs: from __future__ import annotations can be used in all supported Python versions (GH-92418) #92461
• [3.11] gh-92417: asyncio docs: asyncio.run() is available on all supported Python versions (GH-92419) #92462
• [3.10] gh-92417: asyncio docs: asyncio.run() is available on all supported Python versions (GH-92419) #92463
• [3.9] gh-92417: asyncio docs: asyncio.run() is available on all supported Python versions (GH-92419) #92491
• [3.11] gh-92417: doctest docs: remove references to Python <3.6 (GH-92420) #92467
• [3.10] gh-92417: doctest docs: remove references to Python <3.6 (GH-92420) #92468
• [3.9] gh-92417: doctest docs: remove references to Python <3.6 (GH-92420) #92492
• [3.11] gh-92417: json docs: dict is ordered on all supported Python versions (GH-92422) #92464
• [3.10] gh-92417: json docs: dict is ordered on all supported Python versions (GH-92422) #92465
• [3.9] gh-92417: json docs: dict is ordered on all supported Python versions (GH-92422) #92466
• [3.11] gh-92417: stdtypes docs: delete discussion of Python 2 differences (GH-92423) #92472
• [3.10] gh-92417: stdtypes docs: delete discussion of Python 2 differences (GH-92423) #92473
• [3.9] gh-92417: stdtypes docs: delete discussion of Python 2 differences (GH-92423) #92474
• [3.11] gh-92417: logging docs: Remove warning that only applies to Python <3.2 (GH-92425) #92485
• [3.10] gh-92417: logging docs: Remove warning that only applies to Python <3.2 (GH-92425) #92486
• [3.9] gh-92417: logging docs: Remove warning that only applies to Python <3.2 (GH-92425) #92487
• [3.11] gh-92417: unittest.mock docs: remove references to Python <2.6 (GH-92539) #92606
• [3.11] gh-92417: zlib docs, binascii docs: remove Python 2 compatibility notes (GH-92543) #92607

[ambv]

I merged everything that was linked here. If all's done, this can be closed.

[AlexWaygood]

I merged everything that was linked here. If all's done, this can be closed.

Thank you for the reviews! This is now mostly done, but I think there's a few others left to do, so I'd rather keep it open for now. (I've been busy with other stuff lately.)

[AlexWaygood]

This is basically done at this point, and I ran out of energy to finish the remaining bits that are left to do.