Double versionadded labels in typing.NoReturn doc

[Eclips4]

I think it was added by mistake:

cpython/Doc/library/typing.rst

Lines 957 to 958 in 5f7df88

	.. versionadded:: 3.5.4
	.. versionadded:: 3.6.2

cc @JelleZijlstra @AlexWaygood

Linked PRs

• gh-115777: Fix double versionadded directives #116269
• [3.12] gh-115777: Fix double versionadded directives (GH-116269) #116361
• [3.11] gh-115777: Fix double versionadded directives (GH-116269) #116362

[Eclips4]

There's also a couple double versionadded labels in typing.rst: typing.Counter, typing.Deque, typing.ChainMap, typing.AsyncContextManager. For me it is not obvious why is this so.

[JelleZijlstra]

These are correct. The names were added in 3.5.4 and 3.6.2; i.e., they were not present in 3.5.3 and 3.6.1. Maybe there's a way to make that more clear.

[serhiy-storchaka]

I think that this is incorrect. Double versionadded directives only occur in typing.rst. In the rest of the documentation, and in most cases in typing.rst, other principle is used -- specify the earliest version such that all releases between the specified version and the documented version should have such feature. For example, if the feature was added in 3.7 and backported to 3.5.4 and 3.6.2, then the docs in the 3.6 and 3.7 branches will contain version 3.6.2, and the docs in the 3.3 branch will contain version 3.5.4.