Remove mentions of old Python versions in `typing.NamedTuple` docstring

[tomasr8]

Documentation

This came up in this PR
In typing.NamedTuple there are some mentions to Python 3.5 & 3.6 which can be removed:

cpython/Lib/typing.py

Line 2712 in bd1b622

Usage in Python versions >= 3.6::

cpython/Lib/typing.py

Lines 2729 to 2731 in bd1b622

	In Python versions <= 3.5 use::
	Employee = NamedTuple('Employee', [('name', str), ('id', int)])

Linked PRs

• gh-104943: Remove mentions of old Python versions #104945
• [3.11] gh-104943: Remove mentions of old Python versions (GH-104945) #104962
• [3.12] gh-104943: Remove mentions of old Python versions (GH-104945) #104963