Incorrect docs for `typing.Concatenate`

[A5rocks]

Documentation

https://docs.python.org/3.14/library/typing.html#typing.Concatenate says:

Concatenate is currently only valid when used as the first argument to a Callable.

but this is obviously untrue. For example, PEP 612 says:

def f(x: X[int, Concatenate[int, P_2]]) -> str: ...  # Accepted

Linked PRs

• gh-142965: Fix Concatenate documentation to reflect valid use cases #143316
• [3.14] gh-142965: Fix Concatenate documentation to reflect valid use cases (GH-143316) #148899
• [3.13] gh-142965: Fix Concatenate documentation to reflect valid use cases (GH-143316) #148900

[johnslavik]

I thought it would be good to first specify what are the exact valid use locations of typing.Concatenate in the typing spec.
Please see python/typing#2140! :-)